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Valve Style	Size Range	Body Materials	Allowable Seat Materials	Standard Cracking Pressures	Standard Spring Material
UN-3	3/8”-1¼”	316 SS Brass	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® EPDM "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI 3.5 PSI	316 SS
UN-3	3/8”-1-1/4”	C. Steel	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI 3.5 PSI	316 SS
UN-3	1½”-4”	316 SS Brass	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® EPDM "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI	316 SS
UN-3	1½”-4”	C. Steel	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® "Metal to Metal"	1/8 PSI ½ PSI 1.5 PSI	316 SS
UN-3	3/8”-4”	Alloy 20 HASTELLOY^® C	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® EPDM "Metal to Metal"	½ PSI	HASTELLOY^® C
UN-3	3/8”-4”	HASTELLOY^® B	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® EPDM "Metal to Metal"	½ PSI	HASTELLOY^®B
UN-3	3/8”-4”	MONEL^®	VITON^® Buna-N Neoprene TEFLON^® resin KALREZ^® EPDM "Metal to Metal"	½ PSI	MONEL^®