Ease of Installation: Designed for surface mounting on pipes up to 4" O

While the board is a plug-and-play mechanical interface

For accurate installation

These valves are typically rated for saturated steam up to 338°F and water applications ranging from 35°F to 281°F

The HD42AQ253 is designated for CCW (Counterclockwise) rotation when viewed from the lead end/opposite shaft end

Lochinvar & A.O. Smith 100111381 Pilot Assembly 320788-702 Ease of Installation: Designed forThe Lochinvar & A. O. Smith 100111381 Pilot Assembly is a high precision OEM component specifically engineered for Liquid Propane (LP) water heaters. Designed for the 200 and 201 series, this assembly is a direct replacement for HSI control valves in 40 and 50 gallon residential units. As a veteran grade LP pilot assembly with tubing, it ensures reliable pilot flame rectification and consistent ignition cycles, preventing common lockout issues