AR 650671 Dampener Diaphragm for D30 & D50 Diaphragm Pumps.
This component allows the pump to even-out or regulate the output pressure.
This item is a superior, less-costly replacement for the Hypro 9910-650670 Dampener Diaphragm.
Manufactured by Annovi Reverberi (AR), the Italian company that builds ALL Hypro Diaphragm Pumps & Parts. AR entered the US market in 2017 with it's own brand of pumps and parts. This diaphragm is made from AR's unique Blueflex, to provide longer life than traditional black (desmopan) Hypro Diaphragms.
This part wears out. It is a good idea to keep an extra one of these around as a backup for emergencies.