EXTERNAL -BICOMPONENT PASTE LEAK STOP External Sealer for AC R Systems up to 825 psi (57bar) and 0.2" (5mm) Holes. External is a ready-to-use putty leak stop that seals refrigerant gas leaks up to 5 mm on rubber and metal components of air conditioning and refrigeration systems, including those of vehicles. Quick and easy application for a quick and permanent repair: it can be easily mixed by using two fingers and once applied, it permanently repairs the leak in 4-5 hours. Once dried, it can be easily sanded or removed. Benefits: There is no risk of product dispersion in AC/R systems. Ideal for urgent repairs on systems that cannot be stopped (refrigerating rooms, medicine storage facilities, server, and data center air conditioning systems, etc.) Perfectly adheres to metal (copper, aluminum, and steel) and rubber components Resists refrigeration lubricants (Mineral, POE, PAG, PAO and Alkylbenzene) Resists refrigerant gases (CFC, HFC, HCFC, CO2, R32 and R1234yf) Resists additives and flushing fluids, including chlorinated ones Temperature range use: -100-270C (-148-518F) Can be used on either the high or low pressure side Different pressure resistance depending on the size of the leak: 5 mm = 40 bar/580 psi. 2 mm = 50 bar/725 psi. 1 mm = 57 bar/800 psi.