the 661057R is specifically sized (#57) for Liquid Propane (LP) applications

The operating span is field-adjusted by changing the spring

ensuring the burner maintains a consistent manifold pressure across all ports

including many 48DJD

Schneider Electric (Barber Colman) 22-138 Gauge Adaptor the 661057R is specifically sizedThe Schneider Electric 22 138 Gauge Adaptor is a critical fitting designed for precise pneumatic system diagnostics and calibration. This Barber Colman gauge adapter features 1 8" 27 FPT threads, allowing for the seamless integration of standard pressure gauges into existing control loops. Specifically engineered to interface with the 22 137 check valve and 22 143 check valve tee, this adapter ensures a leak free connection for accurate pressure