The A-port is engineered with an equal percentage flow characteristic via a specialized Tefzel flow characterizing disc

a cracked inducer hose

and M9101-AGA-CR01

which would otherwise impede the flow of liquid into the trap

Standard Piping Connection: Features 1/2" NPT inlet and outlet for standard manifold integration

Weil McLain 382-200-411 Gas Valve Kit R-410A The A-port is engineered withThe Weil McLain 382 200 411 Gas Valve Kit is a field proven solution for technicians servicing GV Series 4 high efficiency cast iron boilers. This critical fuel delivery component ensures precise manifold pressure regulation and stable combustion across varying firing rates. Engineered for seamless integration, the kit features a high performance direct spark ignition gas valve designed to maintain consistent BTU output while ensuring safety shut off