I receive many calls from end user’s telling me that their pump has failed from dry running . Upon further investigation I find out that their problem is with a competitor’s piston pump, not an air operated double diaphragm pump.

All Yamada diaphragms are rated to 100 PSI maximum and in many applications are run at pressures greater than 100 PSI without incurring diaphragm damage.

In the early months of 2008 the aluminum air chamber for the NDP-20 and NDP-25 series pump was modified with a groove in order to accommodate the newly designed diaphragms from Yamada.