Milwaukee Twins Oil Line Fitting The Milwaukee Twins Oil Line Fitting, crafted from durable chrome-plated brass, offers an essential connection solution with its adapter featuring a 1/8 NPT male thread on one end and a 1/8 NPT female thread on the other. This fitting ensures compatibility with most aftermarket oil pressure gauges for Big Twin models, guaranteeing a secure and reliable installation. Formerly offered under the J&P Cycles brand. Features: Durable chrome plated brass Adaptor has 1/8 NPT male on one end and 1/8 NPT female on the other Works with most aftermarket oil pressure gauges on Big Twin models