We manufacture high quality brass air fittings, most with nickel chrome finish. Our fittings have lipped internal seals to prevent leakage, not o-rings. BOSS push to connect fittings have a smooth release function. Pre primed threads suit lock tight thread sealant. Maximum pressure tested 400psi. Working pressure 0 - 170psi. Sizes from 1/4 x 1/8 through to 1/2 x 1/2 and anything in between.