1 2"-2" UPVC Nipples Threaded Pipe Fittings Connector BSP Male Adapter Clear

BSP (British Standard Pipe) and NPT (National Pipe Taper) are different thread standards and are not directly interchangeable. BSP parallel male threads have a constant diameter along the thread length and rely on a washer or O-ring for sealing, while NPT threads taper and seal on the thread flanks. If your existing sockets, valves, or manifolds are BSP female, these fittings will connect correctly. If your system uses NPT fittings, you will need a BSP-to-NPT adapter. Check your existing fitting markings or measure thread pitch and diameter before ordering.

For BSP parallel (BSPP) threads, the seal is made at the face of the fitting using a bonded seal washer, fibre washer, or O-ring seated in the female socket — not on the thread flanks. PTFE tape can be applied to the male threads as a secondary measure to reduce friction and minor weeping, but the primary seal must come from a face washer. Do not over-tighten: hand-tight plus one to two turns with a wrench is typically sufficient for UPVC fittings to avoid cracking the body.

No. UPVC is rated for cold-water and ambient-temperature service, typically up to 60 °C (140 °F) at significantly reduced pressure. For hot-water supply lines, underfloor heating circuits, or steam applications, use fittings rated for those temperatures — such as CPVC, brass, or stainless steel. Using UPVC fittings beyond their temperature rating can cause deformation, joint failure, and leaks.

BSP thread size refers to the bore (inside diameter) of the pipe the fitting is designed to connect to, not the outside diameter of the thread itself. To identify your size: (1) measure the outside diameter of the male thread with calipers, then compare to BSP thread OD tables; or (2) count the thread pitch (threads per inch) and cross-reference. Common reference points: ½" BSP thread OD ≈ 20.9 mm, ¾" ≈ 26.4 mm, 1" ≈ 33.2 mm, 1¼" ≈ 41.9 mm, 1½" ≈ 47.8 mm, 2" ≈ 59.6 mm. If unsure, contact us to confirm before ordering.

UPVC has good resistance to many common irrigation chemicals including dilute fertiliser solutions, chlorinated water, and mild acids at ambient temperatures. However, compatibility depends on the specific chemical concentration and temperature. For aggressive solvents, concentrated acids, or alkaline solutions, verify UPVC chemical resistance data for your specific fluid before installation. When in doubt, contact us to confirm suitability.

Yes. The clear UPVC body and corrosion-resistant material make these nipple fittings well-suited for aquarium sump connections, canister filter plumbing, and pond pump circuits. The transparent body allows you to monitor flow and spot air pockets without disassembling the pipework. Ensure all thread seals use food-safe or aquarium-safe PTFE tape and compatible O-rings to avoid introducing harmful compounds into the water.

For a single pipe repair or extension, 1 or 2 pieces is usually sufficient. For a drip irrigation manifold with multiple branch outlets, 5 or 10 pieces is a practical quantity that also reduces the per-unit cost. We recommend ordering one or two extra pieces as spares — nipple fittings are consumable items that can crack if over-tightened or exposed to UV over time, and having a spare on hand avoids delays on future maintenance.