Castel DI308E4S filter drier with 100% molecular-sieve desiccant and integrated moisture indicator, 1/4" connection,no) and listed in English for cBallast institutional and marine customers. Verified technical data: connection size 1/4". Typical applications include refrigerant liquid-line filtration and moisture and acid capture in HFC / HFO refrigeration systems. The DI308E4S sits within the Castel filters and driers range; see companion listings for adjacent variants and accessories.