Tenders for Supply of 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..