Collar Release Breakaway Couplings On this range of couplings the Breakstuds utilised on our standard range are replaced by a collar release mechanism. This arrangement is typically used on loading arm or hose assemblies, where tensile loads being exerted onto the arm or hose are minimised. The collar is released via a cable, pneumatic or hydraulic system, which activates at a predetermined point before over extension of the arm or hose. >> Technical specifications >> Flow characteristics >> Video >> How they work