PVC Threaded Plug Male 1 2" 3 8" 1" BSP Pipe Fittings Pond Aquarium Threaded End

Match the size to the nominal BSP thread size of your existing female socket, not the outer diameter of your pipe barrel. A 20mm plug fits a 3/4 in BSP female socket, 25mm fits a 1 in BSP female socket, and 32mm fits a 1-1/4 in BSP female socket. If unsure, measure the internal diameter of the female socket opening: approximately 20–21mm indicates 3/4 in BSP, 25–26mm indicates 1 in BSP, and 32–33mm indicates 1-1/4 in BSP.

PTFE thread seal tape is strongly recommended. BSP parallel (BSPP) threads are not self-sealing by design — unlike tapered NPT threads, they rely on a face seal or thread sealant to prevent weeping. Apply 2–3 wraps of PTFE tape clockwise around the male thread before installation. This creates a reliable static seal for low-to-medium pressure water systems.

Yes. Rigid PVC is chemically inert in fresh water, salt water, and water treated with standard aquarium additives or pond treatments. It does not rust, corrode, or leach harmful substances into the water column, making it a common choice for aquatic life environments. Ensure the plug is fully tightened with PTFE tape to prevent any seepage.

Both colours are the same rigid PVC material with identical thread dimensions and pressure ratings. The colour difference is purely for visual identification. Blue fittings are conventionally used in some plumbing systems to mark cold potable water lines or to distinguish a secondary circuit (such as a bypass loop) from the primary run. Choose the colour that matches your existing pipework or your own colour-coding convention.

No. These plugs have BSP parallel (BSPP / G-thread) male threads, which are not interchangeable with NPT tapered threads. Attempting to mate BSP and NPT threads will result in cross-threading or an unreliable seal. If your existing fittings are NPT, you will need a BSP-to-NPT adapter or NPT-specific plugs. Contact us to confirm compatibility if you are unsure of your thread standard.

Yes, PVC threaded plugs can generally be removed and reinstalled. Unscrew the plug, clean off the old PTFE tape, and apply fresh tape before reinstalling. Avoid over-tightening with tools, as excessive torque can crack the PVC body or damage the female socket threads. Hand-tight plus a quarter-turn with a strap wrench is sufficient for most low-pressure applications.

For a new pond or aquarium build with multiple capped outlets, the 5-piece or 10-piece packs offer a lower per-unit cost and ensure you have spares on hand. A typical pond filter manifold with 4–6 outlets would benefit from a 5-piece or 10-piece pack of the relevant size. Single-piece packs are best suited for one-off repairs or testing a fit before committing to a larger quantity.