Nipple - Vehicle side for refuelling coupling 3".Also used as a valve to drain BOTH fuel and vent lines from the RFC-88-K and RFC-89-K couplers when used on pitstop rigs or bottles. In this case, this part is fitted to a dump churn made by the customer and requires these extra parts 1 x RFCNIPPLEWELDRING and 1 x RFCWELDNIPRINGORING and 6 x mounting screws to facilitate the correct fitment, OR you could simply order the RFC-88-N-DCK which has all of the parts needed in one KIT!This product is a spare part for the Krontec Refuelling RFC System.