BSP Brass Pipe End Cap & Blanking Plug — 1/2", 3/4", 1" Male Plug & Female Cap

BSP size refers to the nominal bore of the pipe, not the outer diameter of the thread. A 1/2" BSP fitting typically has an outer thread diameter of approximately 20.9mm (≈0.82"), 3/4" BSP is approximately 26.4mm (≈1.04"), and 1" BSP is approximately 33.2mm (≈1.31"). Measure your existing fitting's thread OD and cross-reference a BSP size chart to confirm. When in doubt, select the model option above or contact us before ordering.

A male plug has external (outside) threads and is screwed into a female-threaded port to seal it — common for blanking off ports on manifolds, valves, or tees. A female cap has internal (inside) threads and is screwed onto a male-threaded pipe end to cap it off. Choose based on the thread type of the port or pipe you need to seal.

Model A and Model B refer to slight design or dimensional variations within the same nominal BSP size — such as differences in hex head height, body length, or thread engagement depth. Both are BSP-threaded and generally functionally equivalent for standard sealing applications. If your installation has tight clearance requirements, contact us to confirm which model suits your specific fitting.

Brass generally offers good corrosion resistance in typical indoor plumbing and moderate outdoor conditions, including exposure to water and humidity. For highly corrosive environments — such as saltwater exposure, acidic media, or aggressive chemicals — additional protective measures or alternative materials may be advisable. These fittings are generally suitable for water, air, and oil systems under standard conditions.

Brass BSP fittings of this type typically support working pressures in the range of 150–600 PSI depending on size and application — larger sizes generally carry lower pressure ratings. For safety-critical or high-pressure systems, please verify the specific rating against your system requirements. Contact us to confirm suitability for your application before installation.

Yes, in most cases. BSP parallel threads (BSPP) rely on a sealing washer or thread sealant to achieve a leak-free connection — the threads alone do not seal. We recommend applying 2–3 wraps of PTFE tape to male threads before installation. If your system uses tapered BSP (BSPT), the taper provides some mechanical sealing, but sealant is still recommended for best results. PTFE tape is not included.

No — BSP and NPT threads are not interchangeable. BSP uses a 55° thread angle and Whitworth thread form, while NPT uses a 60° thread angle. The pitch and taper specifications also differ. Attempting to mix them can result in cross-threading, poor sealing, or fitting damage. If your system uses NPT threads, please select NPT-compatible fittings instead.

Brass fittings are commonly used in gas systems in many regions, but suitability depends on local codes, gas type, and pressure rating. In most cases, gas line fittings require certification or compliance with specific standards (such as ANSI or local building codes). We recommend consulting a licensed plumber or gas engineer and verifying local regulations before using any fitting in a gas application.