Grey PVC Threaded Pressure Pipe Fittings Ponds Pools Aquarium 1 2" 3 4" 1"

Match the fitting's inner diameter to your existing pipe's outer diameter and thread standard. For most domestic pond pumps with outputs up to around 3,000 L/h, a 20 mm (½") or 25 mm (¾") fitting is typical. Larger koi ponds or high-flow systems often use 32 mm (1") fittings to reduce flow restriction. Always measure your current pipe or check the pump manufacturer's recommended outlet size before ordering.

Rigid PVC is widely used in aquarium plumbing because it does not leach plasticisers or heavy metals into the water column under normal operating conditions. Allow new fittings to rinse thoroughly with clean water before placing them in contact with livestock. If you are running a sensitive reef or breeding system, a 24–48 hour soak-and-rinse cycle is a prudent precaution.

Yes. PVC has strong resistance to the chlorine concentrations used in residential and light-commercial pool treatment (typically 1–3 ppm free chlorine). The grey colour also resists UV-induced yellowing better than clear PVC, making these fittings suitable for above-ground pool plumbing that sees direct sunlight.

Yes, PTFE (thread seal) tape is recommended for all threaded PVC joints. Wrap 2–3 layers clockwise around the male thread before assembly. Avoid over-tightening — PVC threads can crack if torqued excessively. Hand-tight plus approximately one quarter-turn with a strap wrench is sufficient for most low-to-medium pressure water applications.

Both share the same 25 mm inner diameter bore, but the thread designation (½" vs ¾") refers to the BSP thread size on the fitting's threaded port. A ½" BSP thread has a smaller thread diameter than a ¾" BSP thread. Choose the option that matches the thread size of the male fitting or pipe end you are connecting to — not the bore size alone.

These fittings use BSP threads, which are common in plumbing systems across the UK, Australia, and many parts of Asia. If your existing pipe uses NPT (US National Pipe Thread) or metric ISO threads, the thread form will not match and a leak-free seal cannot be guaranteed. Verify your pipe's thread standard — BSP threads have a 55° thread angle, while NPT threads have a 60° angle — before purchasing.

For a single repair or replacement, the 1 Pcs option keeps cost low. If you are building a manifold, installing multiple filter ports, or want spares on hand for future maintenance, the 5, 10, or 20 Pcs packs offer a lower per-unit cost. Check the price-per-piece across pack sizes in the variant selector above to find the most economical option for your project scope.