Supply Of Maintenance Kit For Duplex Chek Valve As Per Ftil Part No.790039105.one Set Consists Of 04 Items.1 Valve Seat Sub Assy To Pt.no.03910100, Qty-02nos 2 Compression Spring To Pt .no.039802000, Qty-02 Nos 3seal To Pt.no.039703000, Qty-02 Nos 4 Joint To Pt.no.039704000, Qty-01no..