1/4 " Flow Check Valve for Aq37X Back Catalog number: 1002734380 Manufacturer: YOUNG LIN INSTRUMENT Availability: Currently unavailable Price on request - + Recommended CTS-A083 Rotor Seal, Vespel Price on request 419 NON-RETURN-VALVE, O 12-13-15mm Price on request 229 VACUUM RETENTION VALVE Price on request