This bundle includes 2 items: (1) Hypro 9910-650670 Dampener Diaphragm with (1) Hypro 9910-650671 BlueFlex Dampener Diaphragm. Both of these diaphragms, although different in material, will fit the Hypro D30, D50, or D70 Diaphragm Pumps. The Hypro 9910-650670 Dampener Diaphragm comes standard on the aforementioned pumps and is made with Buna rubber material. The Hypro 9910-650671 BlueFlex Dampener Diaphragm is made with improved BlueFlex material that redefines how durable a diaphragm can be, even under tough operating conditions. To extend diaphragm life, the BlueFlex diaphragms have a special shape and thickness that have been carefully optimized to reduce mechanical stresses during the working cycle of the pump, even under difficult working conditions. Its new patented diaphragm retaining plate has a shape that minimizes the chances of the diaphragm becoming caught or nicked by the diaphragm plate.