9material brass qq-b-613, 2.797 in. Min 2.812 in. Max o/a dia, the assembly @shall withstand air pressure of 225 psi for three minutes, one plate, bearing fscm 28968 p/n 901-74, one plate, diaphragm fscm 28968 p/n 901-73, one slip ring fscm 28968 p/n 901-72
