1/4 " Flow Check Valve for Aq37X Back Catalog number: 1002734380 Manufacturer: YOUNG LIN INSTRUMENT Availability: Currently unavailable Price on request - + Recommended 418 NON-RETURN VALVE, O 8-9-10mm Price on request SS4CPA2RT50 Stainless Steel 1PiecePCPA Adj Check Valve Price on request 1002734873 Insert Acetal N-Valved Price on request