Castel DI305E2S liquid-line filter drier, size 052S, with a 100% molecular-sieve core and a built-in moisture indicator, part number DI305E2S. Verified technical data: connection size = 1/4". Provides moisture and acid capture on the liquid line of HFC and HFO refrigeration systems while allowing the technician to read charge condition through the sight glass. Suitable for commercial refrigeration and heat-pump installations.