{"product_id":"female-thread-brass-coupling-adapter-plumbing-fittings","title":"Female Thread Brass Coupling Adapter — Straight \u0026 Reducer Pipe Fittings","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eFemale Thread Brass Coupling Adapter — Reliable Connections for Every Pipe Size\u003c\/h2\u003e\n\u003cp\u003eWhen a leaking joint or a mismatched pipe size brings your project to a halt, you need a fitting you can trust. Whether you're a homeowner tackling a bathroom repair, a plumber running new water lines, or a DIYer building a compressed-air system, having the right female thread brass coupling adapter on hand makes all the difference.\u003c\/p\u003e\n\u003cp\u003eEach piece is a solid brass female-threaded coupling adapter available in straight sizes from 1\/8\" (≈3.2 mm) to 1\" (≈25.4 mm) and in reducer configurations such as 1\/4\"–1\/8\", 3\/8\"–1\/4\", 1\/2\"–3\/8\", 3\/4\"–1\/2\", and more. Both ends feature female NPT-compatible threads. Order as a single piece, a 2-pack, or a 5-pack to match your project needs.\u003c\/p\u003e\n\u003cp\u003eThese brass pipe fittings are well-suited for residential water supply lines, DIY compressed-air plumbing, irrigation system connections, and workshop pneumatic setups — anywhere a durable, corrosion-resistant female-to-female threaded adapter is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔗\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for NPT (National Pipe Taper) thread systems. Verify your pipe thread standard before ordering. Use PTFE tape for a leak-free seal.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Female Thread Brass Coupling Adapters\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-Thread Design\u003c\/strong\u003e — Both ends feature female NPT-compatible threads, making these adapters ideal for connecting two male-threaded pipes or fittings without additional hardware.\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 — Available in straight sizes from 1\/8\" to 1\" and in multiple reducer combinations, so you can step down pipe diameters in a single fitting rather than stacking multiple parts.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🟡\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eSolid Brass Construction\u003c\/strong\u003e — Machined from brass for natural corrosion resistance, making these fittings a dependable choice for water, air, and light fluid applications in both indoor and outdoor environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eHex-Body Profile\u003c\/strong\u003e — The hexagonal body allows standard wrench engagement for secure, torque-controlled tightening — reducing the risk of over-tightening or cross-threading during installation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Choose 1, 2, or 5 pieces per order. Stocking a few extra brass pipe fittings saves time on multi-connection jobs and future repairs.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏠\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e — Suitable for residential plumbing repairs, compressed-air lines, irrigation manifolds, and pneumatic tool connections — wherever a female-to-female threaded brass adapter is needed.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e📐 Technical Specifications — Female Thread Brass Coupling Adapter\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eBrass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Type\u003c\/th\u003e\n\u003ctd\u003eFemale NPT (National Pipe Taper) — both ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Straight Sizes\u003c\/th\u003e\n\u003ctd\u003e1\/8\", 1\/4\", 3\/8\", 1\/2\", 3\/4\", 1\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Reducer Sizes\u003c\/th\u003e\n\u003ctd\u003e1\/4\"–1\/8\", 3\/8\"–1\/8\", 3\/8\"–1\/4\", 1\/2\"–1\/8\", 1\/2\"–1\/4\", 1\/2\"–3\/8\", 3\/4\"–1\/8\", 3\/4\"–1\/4\", 3\/4\"–3\/8\", 3\/4\"–1\/2\", 1\"–1\/2\", 1\"–3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural brass (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Style\u003c\/th\u003e\n\u003ctd\u003eHex body for wrench tightening\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWorking Pressure\u003c\/th\u003e\n\u003ctd\u003eTypically up to 200 PSI (water\/air at ambient temperature) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTemperature Range\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm for your application\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 Pc \/ 2 Pcs \/ 5 Pcs (select above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThread Sealant\u003c\/th\u003e\n\u003ctd\u003ePTFE tape recommended (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-note\"\u003e\n\u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e \u003cstrong\u003eNote:\u003c\/strong\u003e Size notation for reducer adapters: the first number is the larger (inlet) end, the second is the smaller (outlet) end. Always confirm thread standard and pipe diameter before installation.\u003c\/div\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right size for my pipe fitting?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the outer diameter of your pipe threads and match it to the nominal pipe size. For example, a 1\/2\" NPT fitting typically has an outer thread diameter of about 0.840\" (21.3 mm). For reducer adapters, the first number is the larger (female) end and the second is the smaller end — e.g., 1\/2\"–1\/4\" means a 1\/2\" inlet reducing to a 1\/4\" outlet. When in doubt, use a thread gauge or caliper to confirm before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thread standard do these brass adapters use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese fittings are generally compatible with NPT (National Pipe Taper) thread standards, which are the most common in US residential and commercial plumbing. If you are working with BSP (British Standard Pipe) threads, please contact us to confirm compatibility before ordering, as NPT and BSP are not directly interchangeable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these brass couplings be used outdoors or in wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass is naturally corrosion-resistant and generally performs well in damp or humid environments, including outdoor irrigation and garden plumbing. For fully submerged or high-salinity applications, applying PTFE tape and a thread sealant compound is recommended to ensure a watertight, long-lasting connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the pressure rating for these fittings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass pipe fittings of this type typically handle working pressures up to 200 PSI for water and air at room temperature. Actual ratings may vary by size and wall thickness. Contact us to confirm the rating for your specific size and application before use in high-pressure systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need thread sealant when installing these adapters?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. Applying PTFE (Teflon) tape or a pipe thread sealant compound to the male threads before assembly is strongly recommended. Wrap the tape clockwise (when facing the thread end) for 2–3 layers. This ensures a leak-free seal and makes future disassembly easier without damaging the threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a straight coupling and a reducer adapter?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA straight coupling (e.g., 1\/2\") connects two pipes of the same diameter. A reducer adapter (e.g., 1\/2\"–1\/4\") connects pipes of two different diameters, allowing you to step down from a larger pipe to a smaller one in a single fitting. Both types in this listing feature female threads on both ends.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these fittings suitable for gas lines?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBrass fittings are commonly used in low-pressure gas applications in many regions. However, suitability depends on local plumbing and gas codes, the specific gas type, and operating pressure. Always verify compliance with your local codes and consult a licensed professional before installing any fitting on a gas line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"1\u00268\" \/ 1Pcs","offer_id":52331394564370,"sku":"PES3593x1","price":3.39,"currency_code":"USD","in_stock":true},{"title":"1\u00264\" \/ 1Pcs","offer_id":52331394597138,"sku":"PES3594x1","price":3.6,"currency_code":"USD","in_stock":true},{"title":"1\u00264\"-1\u00268\" \/ 1Pcs","offer_id":52331394629906,"sku":"PES3595x1","price":4.15,"currency_code":"USD","in_stock":true},{"title":"3\u00268\" \/ 1Pcs","offer_id":52331394662674,"sku":"PES3596x1","price":3.74,"currency_code":"USD","in_stock":true},{"title":"3\u00268\"-1\u00268\" \/ 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