$2500 FREE FREIGHT PROGRAM is for supplies, repair parts and whole goods. Tanks, pipe, sprayers and other large equipment are not included in this program. Applies to Continental U.S. ground shipments only.

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Dultmeier Sales will be closed Thursday, November 24th and Friday, November 25th in observance of Thanksgiving

Dultmeier Sales will be closed Monday, December 26th.
Normal operations will resume Tuesday, December 27th. We wish you and your family a very Merry Christmas!

Dultmeier Sales will be closed Monday, January 2nd in observance of
New Year's Day

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

Due to the impending winter storm Wednesday afternoon and Thursday, ASAP Express is cancelling all operations effective noon Wednesday until midnight Thursday.

How to Winterize John Blue NGP Piston Pumps | Video

John Blue Company demonstrates how to properly winterize a John Blue NGP Piston Pump. This includes filling the tank with antifreeze after draining the tank of any prior fluid according to manufacturer specifications, and changing the pump setting to 10. Finally, pump RV-antifreeze through the flow divider until it can be seen inside the discharge lines.


Piston pumps, much like plunger pumps, use a plunger or piston to move media through a cylinder. Piston pumps are a type of positive displacement pump, meaning they use expanding and contracting cavities moving in a reciprocating motion to move fluid. This reciprocating motion builds pressure in a cylinder, which moves fluid through. Interior pressure controls the inlet and discharge valves on the cylinder.

There are two main types of piston pump: axial and radial. An axial piston pump contains a number of pistons attached to a block. The pistons move in the same direction as the block. A radial piston pump contains pistons arranger around a block, which is rotated by a drive shaft. The block pushes the pistons, causing compression and expansion and generating pressure.