Y-pack assembly (S8610U3009 and VR8204A2142). Intermittent Pilot (IP) retrofit kit are complete kits converting conventional standing pilot system to IP system. For use with 24-volt (AC) gas-fired atmospheric furnaces, boiler and heating appliances. Y8610U kits are for use with natural gas or liquid propane gas: provides 100% pilot gas shutoff if pilot fails to light; after six-minute delay, trial for ignition is repeated. Ignition trail/delay sequence is repeated until the appliance is lighted or call for heat is removed.