The X-tra Seal 1/2" NPT Male Automotive Style Air Tool Coupler is the perfect solution for minimizing air leaks and ensuring that your air tools work at their best. This coupler features a 3/8" NPT female thread. It has a maximum operating range of 250 psi. With this air tool coupler, you can be sure that your air tools will be working at their best. FleetPride is your First Click in Heavy Duty®.