Needle Seat Back Catalog number: 11-2570 Manufacturer: SCIENCIX Availability: 3 weeks Price on request - + Recommended CTS-21089 Needle Seal (For pH 1-14, for operation up to 130 Price on request CTS-11366 Piston, High Pressure Price on request 11-2525 1/4" Short Comp. Screw (Gold-Plated), 10/pk Price on request