1 1/2" IN-LINE CHECK VALVES WHICH SHOULD BE REPLACED REGULARLY, OR MORE FREQUENTLY DEPENDING ON FREQUENCY OF USAGE.

THESE DUCK BILL VALVES WILL WORK ON BOTH S-PUMPS (VACUUM) AND T-PUMPS (DISCHARGE)! THEY FIT VGII, VIII, VGLP, T-12, T-24 UNITS.