The Watts C7 series is primarily intended for non-potable

Durable Construction: Heavy-duty housing and 1/8" NPT threads withstand professional-grade installation torques

As a direct replacement for the legacy PRD-12X10

If the reading drops below 8-10 mV

Durable Construction: Heavy-duty metal L-bracket and crank arm assembly are built to withstand the rigors of continuous inside duct mounting

Robertshaw 700-507 Gas Valve 30067439-890 The Watts C7 series isThe Robertshaw 700 507 Gas Valve is a professional grade millivolt replacement valve designed for high capacity applications up to 240,000 BTU. Engineering for heavy duty performance, this 7000BMVR S7C model features a slow opening operator that ensures quiet ignition and stable burner engagement, a critical factor for furnace and boiler longevity. This combination valve integrates a manual gas cock, automatic pilot safety, and a millivolt operator