Features & Benefits:R1234yf hose assembly and coupler for Spotgun; Allows you to use your R134a Spotgun kit for R1234yf vehicles; Use with UVU414500A, UVU414565A, UVU471500A, UVU481500; Will not fit Spotgun Jr. kitsWorks with your existing R134a Spotgun Injection system for injecting dye/oil into R-1234YF vehicles without buying a new kit. Works with UVU414500A, UVU414565A, UVU471500A and UVU481500. Does not work with Spotgun Jr. Kits.