The Precision Medical Quad Block Assembly is available oxygen, medical air, and medical vacuum. The Quad Block is made from black anodized high quality lightweight aluminum. The Quad Block consists of one (1) inlet and four (4) outlets are NPT Females. The Quad Block Assembly outlets come standard with DISS Male Demand Check Valve to 1/4” NPT Male. The Quad Block Assembly can be sold individually or attach any fitting on the inlet and complete the full assembly.