Oring, Valve, Internal Air

036-I-BO-BL-ST-VO-TO
Old Version smaller and thinner then new version.
OD:  .5"  12.7mm    Thick:  5/64"  .078" 1.98mm
For internal air uses the same o-ring for front and back.
For external air (bottom line), the rear uses the Tombstone Seal / Valve O-ring, Tippmann Part 02-72