Waterco/Zane Vacuum Relief Valve – 20mm

Genuine Waterco/Zane 20mm vacuum relief valve (VRV) — small part, big job. The VRV lets air into the system when the pump shuts off so water drains from the roof absorber, protecting your Gulfstream strips from heat and vacuum stress and significantly extending absorber life. If your existing valve is cracked, stuck or whistling, replace it — it's the cheapest insurance your solar system has. 20mm female thread, direct fit for Zane systems.