Another option for brake booster port- if u want a similar style port so u don’t have to change anything on brake booster hose... the plastic end on the brake booster hose is 1/2” od. So I ordered a 1/2” od to 3/8” npt “push to connect” fitting. It’s basically the same setup as the stock manifold. There is both dot and non dot styles for these. Dot style just has a tube that goes in the middle so the connection can’t move around.. they use these kind of fittings on air brakes for big rigs so I think they can hold up for what we’re looking for... I also noticed that the inside diameter of the booster hose is 3/8”, but the smallest opening in the whole line is 1/4”... so whatever u do decide to go with, just make sure ur still getting the same air flow and have at the least 1/4” inside diameter with whatever u add. 3/8” ID would be more ideal though.. DO AT YOUR OWN RISK! I have not got my fittings yet but I have used them before for similar ocasions
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