Constant vibration created by air drills, pavement breakers etc. is destructive to air hose couplings, especially the quick-acting type. To provide protection, connect one end of a 1 to 3 meter length of air hose to the tool using the heat-treated No. 3500 Steel Nipple which withstands vibration for a longer period. Connect the other end of the Whip Hose to the air supply with the quick-acting coupling. Whip Hose should remain permanently connected to the tool and should be the same diameter as the supply line hose.