[folivier]

It depends on where the check valve is on your system. It could be either between the filter and compressor or on other side of the filter. If on other side then it should hold the pressure and you could remove it. Feeling lucky?
There should be numbers on it to match to a new one. Not sure of the manufacturer for the fittings, probably DOT rated fittings and any truck shop should have them. Some of us had changed those to ferrule type fittings to eliminate leaks.