RUBBER PART KIT FOR N- 1 REDUCING VALVE CONSISTNG OF 5 ITEMS. 1 ) O RING WABCO PT. No. 531868 SIL DRG. No. 30070224 QTY. 2 Nos. 2 ) O RING WABCO PT. No. 564056 SIL. PT. DRG. No. 30070321 QTY. 1 No. 3 ) DIAPHRAGM WABCO PT. No. 526346 SIL DRG. No. 30070441 QTY. 1 No. 4 ) GASKET WABCO PT. No. 558515 SIL DRG. No. 00184902 QTY. 2 Nos. 5 ). DIRT PROTECTOR WABCO PT. No. 564855 SIL DRG. No. 30180100 QTY. 1 No. PIPE MOUNTING TYPE