Ferrule, External ZDV, 1/2", 316SS

External ZDV reducing ferrules are designed for use with all standard external style fittings - that is, those with a female nut and a male fitting detail. This ferrule has a slightly longer pilot than the internal version, to accommodate the longer external detail. The result is a zero dead volume fitting. A single groove indicates that the ferrule has the longer pilot and is for use in an external detail.