Below you can view our full selection of preformed clamps. These clamps are used to attach fittings and couplings to hoses and tubing. .. Each type of preformed clamp, is designed for applications, which call for different types and sizes of hose. Whether discharge, suction, or pressure types, there is a clamp for you. . Pair them with a compatible clamping tool- automatic or hand-held- for both the fabricator and the application.