The Precision Medical Rail Block Assembly is available oxygen, medical air, and medical vacuum. The Rail Block Assembly (including brackets) is made from black anodized high quality lightweight aluminum. The Rail Block consists of one (1) inlet and three (3) outlets are NPT Females. The Rail Block Assembly outlets come standard with DISS Male Demand Check Valve to 1/8” NPT Male. The inlet comes with a DISS Male to 1/8” NPT Male.