This full line of premier quality quick release couplings are available in a wide variety of materials, sizes, and configurations. Distinctive among this product group is the Bi-Tec Series of self venting, quick release coupling. The combination of a sliding valve and quick lock mechanism makes the handling and safety function of the Bi-Tec Series unique. The coupling process is pressure-less. The only resistance is the force of the spring. Pushing the blue sliding valve forward will allow pressure to be built-up.