{"product_id":"bsp-female-pipe-reducer-coupling-stainless-steel-a2","title":"BSP Female Threaded Pipe Reducer Coupling — Stainless Steel A2, 1\/2\" to 4\"","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eBSP Female Pipe Reducer Coupling — Stainless Steel A2 for Leak-Free Pipe Transitions\u003c\/h2\u003e\n\u003cp\u003eWhen you need to join or reduce pipe sizes in a plumbing, water supply, or compressed air system, a mismatched or low-grade fitting is the fastest way to end up with a leak — or a failed inspection. Contractors, plumbers, and serious DIYers working with BSP-threaded systems need a \u003cstrong\u003eBSP female pipe reducer coupling\u003c\/strong\u003e that threads on cleanly, seals reliably, and holds up over time without corroding from the inside out.\u003c\/p\u003e\n\u003cp\u003eEach fitting is machined from \u003cstrong\u003eA2 stainless steel (304 grade)\u003c\/strong\u003e with fully formed female BSP threads on both ends. Available in 23 size configurations ranging from \u003cstrong\u003e1\/2\" (DN15) up to 4\" (DN100)\u003c\/strong\u003e, including both straight couplings (same size on both ends) and reducer couplings (two different sizes). Whether you need a 1\" to 1.5\" female reducer or a 2\" to 3\" female coupling, there is a variant to match your pipe run. Sold individually (1 piece per order).\u003c\/p\u003e\n\u003cp\u003eTypical use cases include \u003cstrong\u003eresidential and commercial plumbing pipe size transitions\u003c\/strong\u003e, connecting different-diameter sections in \u003cstrong\u003eirrigation and water supply lines\u003c\/strong\u003e, and adapting pipe diameters in \u003cstrong\u003ecompressed air or low-pressure gas distribution systems\u003c\/strong\u003e. The BSP female thread pattern also makes these fittings a go-to choice for maintenance and repair work on existing BSP-threaded infrastructure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eThread Compatibility:\u003c\/strong\u003e BSP (British Standard Pipe) female threads — compatible with BSPP parallel-threaded pipes and fittings. \u003cstrong\u003eNot compatible with NPT threads\u003c\/strong\u003e without an adapter. Confirm your existing pipe thread standard before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eSize Note:\u003c\/strong\u003e Variant names list inlet × outlet pipe nominal sizes (e.g., \"1\\\" to 1.5\\\" female\" = 1\\\" BSP inlet, 1.5\\\" BSP outlet). If you are unsure of your pipe's BSP nominal size, measure the outer thread diameter and compare to BSP sizing charts, or contact us to confirm.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These BSP Female Threaded Pipe Reducer Couplings\u003c\/h2\u003e\n\u003cul class=\"hdiy-features\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eFull Female BSP Threading\u003c\/strong\u003e — Both ends feature precision-cut female BSP threads for a secure, wrench-tight connection to standard BSP-threaded pipe and fittings without cross-threading.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eA2 Stainless Steel Construction\u003c\/strong\u003e — Made from 304-grade stainless steel, offering solid corrosion resistance in wet, humid, and outdoor environments — a practical choice for water supply and irrigation plumbing.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e — 23 variants covering 1\/2\" through 4\" BSP nominal sizes, including straight couplings and reducer configurations, so you can match the exact pipe size transition your system requires.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eLeak-Resistant Seat Design\u003c\/strong\u003e — The machined thread profile is designed to seat evenly with PTFE tape or thread sealant, supporting a reliable seal on water lines, compressed air lines, and low-pressure gas distribution systems.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eWrench-Flat Body\u003c\/strong\u003e — The hex or flat body profile (typical of this fitting type) allows standard pipe wrenches or adjustable wrenches to apply proper torque without slipping — important for achieving a leak-free threaded pipe connection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e \u003cspan\u003e\u003cstrong\u003eResidential \u0026amp; Light Commercial Rated\u003c\/strong\u003e — Suitable for typical plumbing, irrigation, and compressed air applications. Each piece is sold individually, making it easy to order exactly the quantity needed for your repair or installation job.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — BSP Female Pipe Reducer Coupling\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eBSP Female Threaded Pipe Coupling \/ Reducer Coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 Stainless Steel (304 Grade)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Standard\u003c\/th\u003e\n\u003ctd\u003eBSP — British Standard Pipe (compatible with BSPP parallel threads)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFemale (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSize Range\u003c\/th\u003e\n\u003ctd\u003e1\/2\" (DN15) to 4\" (DN100) — see variant options for all configurations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Configurations\u003c\/th\u003e\n\u003ctd\u003eStraight coupling (same size) and reducer coupling (two different sizes) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eMill \/ brushed stainless (natural A2 finish)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Sealant\u003c\/th\u003e\n\u003ctd\u003ePTFE thread tape or pipe thread sealant compound (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTypical Applications\u003c\/th\u003e\n\u003ctd\u003ePlumbing, water supply, irrigation, compressed air, low-pressure gas lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNPT Compatibility\u003c\/th\u003e\n\u003ctd\u003eNot compatible — BSP and NPT threads are not interchangeable without an adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm (varies by size)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right size BSP female reducer coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your existing pipe threads and match it to the BSP nominal size. As a reference, a 1\" BSP pipe has an outer thread diameter of approximately 33.25mm (≈1-5\/16\"). If you are reducing from one pipe size to another, select the variant that lists both sizes — for example, \"1\" to 1.5\" female\" means a 1\" BSP inlet and a 1.5\" BSP outlet. When in doubt, contact us to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow strong is a stainless steel A2 pipe coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA2 stainless steel (304 grade) generally offers a tensile strength of around 500–700 MPa, making it suitable for typical residential and light commercial plumbing, water supply, and low-pressure gas lines. For high-pressure industrial applications, verify the working pressure rating against your system specifications before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these BSP couplings be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. A2 stainless steel is corrosion-resistant and performs well in outdoor, humid, and wet environments. It is generally suitable for freshwater plumbing, irrigation systems, and exposed pipe runs. For marine or highly chlorinated environments, A4 (316) stainless steel is typically recommended for longer service life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these fittings compatible with BSP and BSPP threads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These couplings use BSP (British Standard Pipe) female threads, which are compatible with BSPP (parallel) threaded pipes and fittings. BSP threads are widely used in plumbing systems across the UK, Europe, Australia, and Asia. They are \u003cstrong\u003enot directly compatible with NPT (National Pipe Taper) threads\u003c\/strong\u003e used in North American systems — an adapter is required if connecting to NPT-threaded components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need thread sealant with these couplings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFor a leak-free connection, applying PTFE thread tape or a suitable pipe thread sealant compound is generally recommended, especially on parallel (BSPP) threads. This is standard practice for most threaded pipe fittings regardless of material, and helps compensate for minor surface variations in the thread engagement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a coupling and a reducer coupling?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA standard coupling connects two pipes of the same diameter. A reducer coupling (also called a reducing coupling or pipe reducer) connects two pipes of different diameters, allowing you to transition from a larger pipe to a smaller one — or vice versa — within the same run. Select the variant that matches your inlet and outlet pipe sizes. Variants listed with a single size (e.g., \"2\" female\") are straight couplings; variants with two sizes (e.g., \"2\" to 3\" female\") are reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat applications are these BSP female reducer couplings suitable for?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese fittings are typically used in residential and commercial plumbing, water supply lines, irrigation systems, compressed air lines, and low-pressure gas distribution. They are also commonly used in industrial fluid handling where BSP-threaded connections are standard. Always verify the pressure and temperature ratings are appropriate for your specific application.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"1\u00262\" to 1.5\" female","offer_id":52336729686290,"sku":"GYLJJHYJJ02118x1","price":37.39,"currency_code":"USD","in_stock":true},{"title":"1\u00262\" to 2\" female","offer_id":52336729719058,"sku":"GYLJJHYJJ02127x1","price":54.89,"currency_code":"USD","in_stock":true},{"title":"3\u00264\" to 1.5\" female","offer_id":52336729751826,"sku":"GYLJJHYJJ02129x1","price":38.66,"currency_code":"USD","in_stock":true},{"title":"3\u00264\" to 2\" female","offer_id":52336729784594,"sku":"GYLJJHYJJ02109x1","price":64.03,"currency_code":"USD","in_stock":true},{"title":"1\" to 1.5\" female","offer_id":52336729817362,"sku":"GYLJJHYJJ02120x1","price":39.48,"currency_code":"USD","in_stock":true},{"title":"1\" to 2\" female","offer_id":52336729850130,"sku":"GYLJJHYJJ02115x1","price":55.47,"currency_code":"USD","in_stock":true},{"title":"1\" to 2.5\" female","offer_id":52336729882898,"sku":"GYLJJHYJJ02116x1","price":98.78,"currency_code":"USD","in_stock":true},{"title":"1\" to 3\" female","offer_id":52336729915666,"sku":"GYLJJHYJJ02117x1","price":137.88,"currency_code":"USD","in_stock":true},{"title":"1.2\" to 1.5\" female","offer_id":52336729948434,"sku":"GYLJJHYJJ02121x1","price":41.14,"currency_code":"USD","in_stock":true},{"title":"1.2\" to 2\" female","offer_id":52336729981202,"sku":"GYLJJHYJJ02119x1","price":56.41,"currency_code":"USD","in_stock":true},{"title":"1.2\" to 3\" female","offer_id":52336730013970,"sku":"GYLJJHYJJ02124x1","price":140.46,"currency_code":"USD","in_stock":true},{"title":"1.5\" female","offer_id":52336730046738,"sku":"GYLJJHYJJ02122x1","price":43.51,"currency_code":"USD","in_stock":true},{"title":"1.5\" to 2\" female","offer_id":52336730079506,"sku":"GYLJJHYJJ02126x1","price":49.1,"currency_code":"USD","in_stock":true},{"title":"1.5\" to 2.5\" female","offer_id":52336730112274,"sku":"GYLJJHYJJ02113x1","price":99.62,"currency_code":"USD","in_stock":true},{"title":"1.5\" to 3\" female","offer_id":52336730145042,"sku":"GYLJJHYJJ02114x1","price":150.39,"currency_code":"USD","in_stock":true},{"title":"2\" female","offer_id":52336730177810,"sku":"GYLJJHYJJ02112x1","price":65.27,"currency_code":"USD","in_stock":true},{"title":"2\" to 2.5\" female","offer_id":52336730210578,"sku":"GYLJJHYJJ02130x1","price":106.3,"currency_code":"USD","in_stock":true},{"title":"2\" to 3\" female","offer_id":52336730243346,"sku":"GYLJJHYJJ02110x1","price":148.96,"currency_code":"USD","in_stock":true},{"title":"2.5\" female","offer_id":52336730276114,"sku":"GYLJJHYJJ02111x1","price":113.87,"currency_code":"USD","in_stock":true},{"title":"2.5\" to 3\" female","offer_id":52336730308882,"sku":"GYLJJHYJJ02123x1","price":154.2,"currency_code":"USD","in_stock":true},{"title":"3\" to 4\" female","offer_id":52336730341650,"sku":"GYLJJHYJJ02125x1","price":271.97,"currency_code":"USD","in_stock":true},{"title":"3\" female","offer_id":52336730374418,"sku":"GYLJJHYJJ02108x1","price":156.98,"currency_code":"USD","in_stock":true},{"title":"4\" female","offer_id":52336730407186,"sku":"GYLJJHYJJ02128x1","price":268.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-06_2b03d097-5c2c-4b6a-af68-d4377b0a25aa.jpg?v=1781156052","url":"https:\/\/homediyer.com\/products\/bsp-female-pipe-reducer-coupling-stainless-steel-a2","provider":"HomeDIYer","version":"1.0","type":"link"}