Dultmeier Sales will be closed Thursday, November 22nd and Friday, November 23rd in observance of Thanksgiving

Dultmeier Sales will be closed Tuesday, December 24th at 12pm and all day Wednesday, December 25th.
Normal operations will resume Thursday, December 26th. We wish you and your family a very Merry Christmas!

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

Dultmeier Sales will be closed Thursday, July 4th and Friday, July 5th in observance of Independence Day.
Normal operations will resume Monday, July 8th. 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!

How to Service Seals on Plunger Pumps | Video

In this video, CAT Pumps® demonstrates how to service, repair, and replace the seals on the 650 or 660 series plunger pumps. This includes proper removal of the manifold, removal of the seals, inspection and servicing of the seals, and reassembly of the pump.

View our other Cat Pumps videos here!


Plunger pumps, a type of positive displacement pump, work by expanding and contracting a cavity in a cylindrical chamber using a plunger rod. As the rod contracts the cavity, fluid is expelled through a discharge valve. The rod is then backed off of the cavity, closing the discharge valve and opening an inlet valve, which floods the cavity with fluid again.

CAT PUMPS® offers several different designs of plunger pump, all of which share the same basic concept. A direct flow pump, described above, a flushing port pump, which adds an inlet and outlet valve to move a flushing liquid through the pump, and a "Superflow" pump that includes a flow-through ceramic plunger.