Designed for installation in waste discharge and bilge pumpout systems. When installed, the waste can be pumped directly into a holding tank or, when legal, diverted to an overboard discharge fitting. The valve is supplied with a stainless steel locking ring that allows the lever to be locked in the holding tank position when operating in no-discharge zones. When used for bilge pumping, two separate bilge sections can be emptied with a single pump. All polyester and stainless steel construction will withstand corrosive waste chemicals and bilge water.