Comparison : Item # 1317-46-560V, 1/8" FPT x 1/8" FPT Check Valve 3,000 PSI Brass with Viton Seal
Item # 1317-46-561V, 1/4" FPT x 1/4" FPT Check Valve 3,000 PSI Brass with Viton Seal
Item # 1317-46-562V, 3/8" FPT x 3/8" FPT Check Valve 3,000 PSI Brass with Viton Seal
Item # 1317-46-563V, 1/2" FPT x 1/2" FPT Check Valve 3,000 PSI Brass with Viton Seal
Item # 1317-46-564V, 3/4" FPT x 3/4" FPT Check Valve 3,000 PSI Brass with Viton Seal