Yellow Jacket Automotive R-134a A/C Coupler w/ 1/4" male flare - LO-Side (41318) $43.59 Brand yellow jacket Model 41318 MPN 41318 Item Length 4 in condition New YELLOW JACKETAUTOMOTIVELO-SIDE COUPLER w/ 1/4" MALE FLARER-134A ECONOMY A/C COUPLER41318A basic R-134a service coupler with no control valve. Snaps on for instant flow.