0.1250 in. NPT Pressure Gauge Port; Edelbrock products offer improved performance and aesthetics for a broad array of vehicles and engines. 'Proven performance' is the philosophy by which Edelbrock was founded and it continues to this day with the highest standards for performance and quality. Edelbrock core products are engineered manufactured and tested in the USA to ensure the best quality possible. This is further backed by some of the best warranties in the industry and a highly qualified technical support staff.; 0.3750 in. NPT Inlet And Outlet Ports; Accepts AN Straight Thread 37 Deg. Adapters; Engineered For The Optimum In Flow; Ideal For Street And Race Applications; Machined From Billet Aluminum; O Rings Required