Auto R-134a calibrated A/C Screw Injector w/out Service CouplerProduct Description This 2 oz. injector is easy to refill and easy to operate. Calibrations are clearly marked on the injector. Connect to A/C lo-side and rotate handle. AC/R and auto models. Maximum port pressure of 250 psi. Made in the USA Auto R-134a calibrated A/C screw injector without service coupler |