Features Excellent Aluminum Material: This AC oil dye injector is made of excellent aluminum material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. Wide Application: This AC oil dye injector has a wide range of applications and can be used for fluorescent dyes for leak monitoring, all oil types (POE or mineral oil) as well as all home office ac and automotive ac systems. R134A Low Side Quick Connector: This AC oil dye injector features an R134A low side quick connector with a 1/4 inch SAE male and 13mm female. Easy Operation: With a refrigeration AC oil dye injector full of refrigeration oil, screw the check valve onto the cartridge and tighten. Tighten the inner and outer cylinders clockwise, then use a bit of 1/4 SAE threaded insert to expel a small amount o Main Function: This AC oil dye injector has a capacity of 1/4 oz to 2 oz and is used to inject oil and dye into the air conditioning compressor through the low pressure suction side. Specification: Item Type: AC Oil Dye Injector Kit Material: Aluminum  Package List:1 x AC Oil Dye Injector2 x Connector Package List 1 x AC Oil Dye Injector 2 x Connector