WHIP CHECKSSafety cables should be used on all blast hose and air connections to reduce the danger caused by hose coupling failure. Whip Check Safety CablesSizeLength3mm12″ inch3mm20″ inch7mm38″ inchDesigned for 1/2″ to 1 1/4″ OD hose and for 1 1/2″ to 3″ OD hose.