FILTER DRIERS Everwell liquid line molecular filter driers feature: copper connection for solder, steel connection for flare, all filters meet desiccant standards and are treated to be corrosion resistant, compatible with refrigerants: R12/R22/R502/R507A/R134A/R404A/R407C/R410A, M.W.P. 610 PSIG/42 bar, temp. range: -40 to 160° F / -40 to 160° C, and are registered by U.L.