The 1/2 –inch male fitting incorporates a new patent-pending design for quick and easy installation. Highlights of this feature include adapters that are designed to retrofit with the existing pump head design. With the standard ½-inch male NPT fittings you don''t need to special order expensive cam-lock adapters. Fittings are made of natural PVDF (Kynar®). The larger orifice size allows for higher flow rate with viscous fluids. The peristaltic pumps now ship with either a 3/8-inch tube compression fitting or the ½-inch male NPT fitting.