SmartLock fittings are a superior product that utilize metal to metal sealing technology for a more secure and permanent seal, compared to other fittings on the current market that use rubber o-rings as the main sealing agent. Rubber o-rings deteriorate at a rapid pace once exposed to external environments (refrigerants, oils, temperature, ozone, etc.). SmartLock fittings have the highest design pressure range and burst pressure range on the market.