This ASV comes on many RO systems including the Ultima Water Systems GRO36-4, GRO50-4, -5, -ALK, GRO75-5, & -ALK and many other brands of RO systems.
The water passes through this ASV from one end to the other end. Connect the pre-filters outlet to the end marked “in” then the membrane inlet to end marked “out”. Connect the membrane product water outlet to either end with no marking and to the post filter tee to the other end with no markings.
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