【UNIVERSAL COMPATIBILITY】This R134A refill hose is designed for car air conditioning and refrigeration systems, compatible with R12, R22, and R134a ports. Thanks to its universal adapters (1/4 \" male/female, 5/16 \"), it easily fits various vehicle types and equipment, offering a versatile solution for refrigerant refilling. 【PRECISE MEASUREMENT AND OPTIMAL CONTROL】Equipped with a high-precision pressure gauge with scales for R12, R22, and R134a, this kit allows real-time monitoring of system pressure. The clear, easy-to-read display ensures accurate dosing of refrigerant, guaranteeing optimal performance of the air conditioning system. 【REINFORCED AND DURABLE CONSTRUCTION】Made from premium quality polycarbonate, the hose withstands extreme temperatures and frequent wear and tear. Its 50 cm (19.68 inches) length offers excellent maneuverability, while quick connectors and metal seals ensure secure, leak-free connections. 【COMPLETE AND EASY-TO-USE KIT】Package includes: 1 blue refill hose with pressure gauge, 1 BPV31 piercing valve (non-OEM), 2 adapters (1/4 \" to 1/4 \", male/female), 1 hex key, and 1 protective cap. Installation is simple: connect the hose to the service port, use the valve to access the system, then proceed with safe refilling.