Black Plunger Seal Back Catalog number: CTS-6613 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21240 ACQUITY I-Class SM-FTN Performance Maint. Kit,2890 Price on request CTS-A103 Outlet Check Valve Price on request CTS-21095 Seal Wash (0.0787 ID, Fixed, Bio), 2/pk Price on request