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

How to Rebuild a Plunger Pump | Video

CAT PUMPS® demonstrates how to disassemble plunger pumps, inspect and repair the valves, seals, and plungers on plunger pumps, and reassemble plunger pumps on a variety of different models. This includes 3, 5, 7, 15, 25, and 35 frame plunger pumps. Different frames operate differently, however some pumps are similar enough that they've been grouped up for convenience. They are: 5, 7, and 15 frame plunger pumps at 0:00, 3 and 25 frame pumps at 13:17, and 35 frame pumps at 23:06.

View our other Cat Pumps videos here!


Plunger pumps are a type of positive displacement pump that use a plunger to move fluid through a cylindrical chamber. Plunger pumps do this by expanding and contracting a cavity in a reciprocating motion, opening and closing discharge and inlet valves at different times. The contraction of the cavity builds pressure, forcing fluid out the discharge valve.

Increasing the number of pump cylinders increases the capacity of the pump. Simplex pumps have one cylinder, Duplex have two, and Multiplex have any amount more than two.