this replacement knob retains the same physical dimensions and stem attachment for both the original series and the newer Lead-Free (LF) versions of the Watts 70A valves

making it versatile for various regional equipment setups

this high-performance accessory facilitates the reliable transmission of actuator torque to damper blades or pin extensions

the 1/2" MPT side uses standard male pipe thread designed for a tapered

Modine 5H0730570003 Block Vent Switch this replacement knob retains theThe Modine 5H0730570003 Blocked Vent Switch is a critical safety component engineered to monitor flue gas temperatures and prevent hazardous operating conditions. This genuine OEM replacement part is specifically designed for Modine PD400 and BD400 unit heaters, serving as the direct functional successor to the legacy 5H73057 3 model. Operating as a manual reset safety switch, it is calibrated to trip when vent temperatures reach 200F (93C),