Allows valve to be mounted behind a bulkhead with the handle on the outside.Jabsco Handle Extension Spacer for 45490-1000 ‘Y’ Valve.FeaturesWaste and corrosion-resistant construction throughoutRotating ports allow for variable routing of hoses onto the valveCan be operated through bulkhead by use of optional handle extensionCan be padlocked so that waste can only go to the holding tank to comply with some local regulations (padlock not included)