This kit is the answer to the job we all hate - oil changes. By installing an E-Z oil drain hose into your existing drain plug you simply pull the other end out the exterior drain plug hole and drain the oil from outside your boat. It doesn't get any easier than this! The hose isĀ 44" long and has a cap. Gen 4 BBC oil pans are typically 1/2"-20 and Gen 5/6 pans are typically 12mm metric. These drains kits use 3/8" marine hose. NOTE: To pull drain hose through the external boat drain plug requires a minimum 7/8" hole.