I spent hours messing around the over day trying to get air in my Ribeye tubes. (I believe they are the HR type.?). I ended up just using a standard pump and correct size adaptor.
yeah no way id be doing that at sea, luckily she still floats if the tubes are deflated haha.
think ill spring for a $7 fitting for the pump, just annoying how little things add up. if i could get one here id get an inline adaptor and gauge. its going to be annoying using a gauge and having a little deflate.