Package of 2 x Hypro 9910-650670 Dampener Diaphragms. These dampener diaphragms work on the Hypro D30, D50, and D70 Diaphragms Pumps and are made with Buna rubber material. They are designed to help even out or regulate output pressure. It is always good practice to have extra replacements on hand just in case your diaphragms begin to wear.