This threaded pipe plug is machined to 7/8-18 NPT specification for sealing an open port in cab and chassis applications, fitting Mack platforms. It threads into a drilled passage or housing to keep fluid or air from leaking out. It is packaged one per sell unit.Interchanges:210884Cummins 3040815Mack 6635-10HP5NSFeaturesPipe plug with 7/8-18 NPT threadSold as 1 EACHTech SpecsThread: 7/8-18 NPTSell Pack: 1 EACH