PVC Straight Pipe Coupling — Socket Slip Joint Fitting, ID 20mm–110mm

Match the coupling's inner diameter (ID) to the outer diameter (OD) of your pipe. For standard metric PVC, the pipe OD and coupling ID are typically the same nominal size. For example, a 25mm ID coupling generally fits a 25mm OD pipe. Available sizes range from 20mm (≈3/4") to 110mm (≈4-3/8"). If you're unsure, measure your existing pipe's outer diameter with calipers and select accordingly.

PVC straight socket couplings of this type are generally rated for working pressures up to 150–200 PSI at room temperature when properly solvent-welded, though the exact rating depends on pipe schedule, size, and installation quality. Pressure capacity decreases as water temperature rises. Contact us to confirm the pressure rating for your specific size before use in high-pressure applications.

Yes — PVC is inherently resistant to corrosion, moisture, and most soil chemicals, making it well-suited for underground burial and sheltered outdoor plumbing. For installations with direct, prolonged UV exposure (such as above-ground irrigation lines in full sun), painting the fitting with a UV-resistant paint or wrapping it is recommended to prevent surface brittleness over time.

No — these are solvent-weld (slip) socket fittings, not threaded. Each end has a smooth socket that accepts the plain end of a PVC pipe. The joint is made permanent by applying PVC primer followed by solvent cement, which chemically fuses the pipe and fitting into a single piece. No wrenches or thread tape are needed.

These couplings are designed for standard PVC pipe. While the socket dimensions may physically accommodate CPVC or ABS pipe in some sizes, the solvent cement chemistry differs between materials. Using PVC fittings with CPVC or ABS pipe is generally not recommended without verifying chemical compatibility of the cement. For mixed-material connections, a transition fitting or mechanical coupling is typically the safer choice.

A straight socket coupling (this product) creates a permanent, solvent-welded joint — ideal for extending a pipe run, repairing a cracked section, or joining two pipe ends where future disassembly is not needed. A union fitting, by contrast, allows the joint to be unscrewed and separated later without cutting the pipe. If you anticipate needing to service or remove the fitting in the future, choose a union; for permanent inline connections, this coupling is the right tool.

Wall thickness varies by size and is typically consistent with Schedule 40 socket fitting dimensions for each nominal diameter. For exact wall thickness specifications by size, please contact us to confirm before ordering for applications with strict dimensional requirements.