Rapid Locking System (RLS) is a patented press-to-connect fitting specifically developed for the high-pressure application of the HVAC and refrigeration industries. RLS press fittings offer an alternative to the conventional process of brazing, providing contractors and MROs with an approach to joining HVAC/R lines that is fast, safe, consistent and efficient. RLS press fittings are fully registered and listed to UL207 for pressures up to 700 PSI and can be installed in seconds, 60% faster than brazing, RLS notes.