Air Foot Switch Replacement Paris installation Instructions Installing New Air Switch (TECH-324) 1o Oid Hose (718700 1. Thread the mall hose bath onto the new air switch. 2. Slide he hose bairn through the round hale in the bosom of the swill box, 2. Thread on the neutron your old alr switch. 4. Push the end of hose onion the hose barb until # touches the nut 5. Then place wirehair tie over the hose and hose barb to sct s & strain relies. tantalizing New Alr Switch (THIGHS-329) to New Hose 1.