Ritchie Universal A/C Disposable Injector Universal disposable 1 oz. applicator for fast economical dispensing. Universal dye for all common refrigerants and oils.The fluorescent tracer dye is added to the HVAC system by itself or in a leak sealing product and circulated,leaks can be found using a blue light. Less costly and faster than many other methods One dye minimizes inventory No back-up refrigerant to move dye into system Maximum system port pressure of 80 psi Not for direct injection into R-410A systems due to high pressure Made in the USA