How PVC Compression Style Couplings Work

Learn how PVC compression style repair couplings work, what applications they are best suited for, and how to properly install them.

PVC compression couplings - aka repair couplings - are used to repair damaged sections of PVC pipe. Basic repair couplings utilize a rubber gasket and compression ends to create a positive, watertight seal. These couplings are usually tightened by hand and don’t require glue, making repairs relatively quick and easy. Though not recommended for permanent repairs, quality couplings will hold up indefinitely. In this video, we show how to install both a basic repair coupling as well as the GripLoc style.

Be sure to wear safety glasses when cutting PVC, as shards can be sent flying!

For basic repair couplings, start by using a PVC cutter to remove the damaged section of pipe. Remove only enough pipe to be able to slide the body of the coupling over it, keeping in mind the length of the coupling (for long cracks and splits, an alternate method of repair is needed). If the body of the coupling can’t be slipped over the pipe after the initial cut, remove more of the pipe in small increments until the body can be wiggled over both ends.

Once there’s enough room for the body, put it aside for a moment and slide the compression end onto the pipe, followed by the gasket. The gasket should not be pushed too far down the pipe, just enough to make room for the body to be slipped on. Put the body back onto the pipe, and use the compression ends to slide the gasket inside the coupling. Tighten both ends - preferably by hand, but a large wrench or adjustable pliers can be used - and you should be ready for running water again.

The GripLoc Compression Repair Coupling is a heavier-duty version of the same idea. Instead of a gasket, these use an O-ring, a spacer (or a gland ring), and a metal grip ring to create and maintain the seal.

Installation is pretty much the same: cut the pipe enough for the body to slip on both ends, then slide the compression end, grip ring, and O-ring on (in that order) on each end of the pipe. Take care not to slide the metal GripLoc ring more than an inch past the end - if you do, use only the compression end to slide it back into position.

Slide the coupling body over the pipe ends, push everything together using the compression ends, and tighten. It’s possible that the O-ring will not slide far enough into the spacer to allow you to tighten the nut - in this case, use something soft to gently push the ring into place.

Browse PVC Compression Couplings at https://www.plumbingsupply.com/pvccomp.html

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