Benefits of conventional plumbing unions PLUS the added security of Buna O-rings. Schedule 40 PVC Union Fittings w/ Buna O-ring Seal feature Buna O-rings designed to last longer and provide a better seal than conventional union O-rings. High-quality plumbing unions allow you to safely disconnect rigid plumbing lines from the main line whenever your plumbing installation requires attention. Slip socket x slip socket fitting.
Aquarium Plumbing Tip