ZK-002, ZK-002-1, ZK-002-2 3/8", 1/4", 1/2" NPT F-R-L Description Combo Air Line Filter-Import Model No. Description ZK-002 3/8" NPT F-R-L ZK-002-1 1/4" NPT F-R-L ZK-002-2 1/2" NPT F-R-L Inquire Now