Spears is the PVC reference for the trade — Schedule 40 and 80 fittings, ball valves and check valves, and an engineering sourcebook that most people in irrigation have consulted at some point for pressure ratings, temperature derating and chemical resistance.
Their Engineering Sourcebook is linked from our Resources page. If you are running chemistry through PVC, check the resistance tables before you commit to a material.
True union means both ends unscrew, so the valve comes out for service without cutting the line — the difference between a ten-minute job and re-plumbing a section. Quarter-turn on/off. One-year warranty
Heavier wall than Schedule 40 for higher pressure and industrial duty, and CPVC where the water runs hot or the chemistry is aggressive — fertiliser injection lines especially
