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The WATTS FV-4M1 is a high capacity automatic air vent valve designed for hydronic heating systems. This product features a brass body and MNPT connection, suitable for both hot and cold water distribution. The air vent is equipped with a silicone rubber seal and a polyethylene float for reliable operation.
Ideal for use in glycol systems and as an anti-vacuum device.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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