POH Kit for Check Valve to RDSO Drg. No. SKETCH- 98111, Alt. ' 1 ', consisting of four items as per list given below and to RDSO Specn. No. 02- ABR- 02 with Amndt. 4 of Sep ' 16, Appendix ' I ' S. NO. 1. FILTER, ITEM NO. 2 OF THE RDSO DRG. No. SKETCH- 98111, QTY./ KIT = 1 NO, S. NO. 2. VALVE SEALING RING, ITEM NO. 4 OF THE RDSO DRG. No. SKETCH- 98111, S. NO. 3. COMPRESSION SPRING, ITEM NO. 6 OF THE RDSO DRG. No. SKETCH- 98111, S. NO. 4. SEALING RING A 39 46, ITEM NO. 7 OE THE RDSO DRG. No. SKETCH- 98111, QTY./ KIT = 1 NO.