Overhauling kit for Duplex Check Valve for Escorts make Air spring suspension system consisting of 04 items. S. No. Pescription Escorts Drg No. Qty/ Kit ( 1 ) Flat Sealing Ring 4EB 6795 02 Nos. ( 2 ) Compression spring 4A 76146 02 Nos. ( 3 ) Valve Head 4A 48128 02 Nos. ( 4 ) O Ring 4A 27763/ 26 02 Nos.