Hey all, I’ve got a 790 with a w1 welder block in it and I’ve got a few questions. I tore it down to deep clean and do new gaskets and seals, and I see the D port block between the tank and cylinder has a gasket to block off the port. However the inside of the port is functional and goes through to the inside of the cylinder. I’m curious as to why it had the blocked off gasket.