Dultmeier Sales will be closed Thursday, November 26th and Friday, November 27th in observance of Thanksgiving

Dultmeier Sales will be closed Thursday, December 24th at 12pm and all day Friday, December 25th.
Normal operations will resume Monday, December 28th. We wish you and your family a very Merry Christmas!

Dultmeier Sales will be closed Friday, January 1st in observance of
New Year's Day

Dultmeier Sales will be closed Monday, July 5th in observance of Independence Day.
Normal operations will resume Tuesday, July 6th. We wish you a happy 4th of July!!

We are experiencing some technical difficulties on dultmeier.com and apologize for any inconvenience.
If you are running into issues, please phone your order in to 1-888-677-5054

Customer Pickup Orders: to help reduce exposure for our customers and our employees, if you are placing an order for in-store pickup please call in your order ahead of time or place your order online and pre-pay with a credit card. Be sure to let us know when you plan to arrive. We will have your merchandise ready for you and will greet you outside our facility. Thank you for your help!

Manufacturing Process of Diaphragm Pumps & Design Explained | Video

A brief video describing the design choices and safety features seen in ARO EXP diaphragm pumps. ARO pumps feature more bolts, dome-shaped caps, 1.5 inch thick casing, and glass-filled vinyl thermoset caps.


Diaphragm pumps are a type of positive displacement pump that move fluid using two large diaphragms. These diaphragms, as they move back and forth, fill with air or fluid alternately. The pressure change in each diaphragm controls the flow of fluid.

ARO EXP diaphragm pumps include a number of features designed to enhance their pumps efficiency and safety. This includes a number of extra bolts to increase structural integrity and ripless dome-shaped caps to prevent leaks. Also included are a unique SimulShift valve to prevent stalling and increase flow, as well as a Quick Dump valve to further decrease stall chance.