The John Blue 2-piston, semi-hydraulic, Diaphragm Pump is ideal for gardening, small sprayers, washers, and liquid transfer. It’s compact and lightweight and can be driven by PTO, electric motor, or gasoline engine, depending on your specific application needs. All wetted parts are plastic coated to withstand today’s agricultural and industrial chemicals. The diaphragms are constructed from chemical resistant elastomers for excellent corrosion resistance.

Patented Technology Features

  1. The heads are designed with a patented technology that includes an aluminum die-cast core inside a polypropylene structure offering superior strength.
  2. Washers and diaphragm bolts are in 316 stainless steel, an exclusive feature.
  3. Die cast crankcase incorporating a new cooling system.
  4. New chemically resistant diaphragm material pre-deformed to reduce the amount of deflection, increasing diaphragm life. The diaphragm material is compatible with most of the corrosive chemicals on the market today.
  5. A short crankshaft stroke means the longest life possible.
  6. New connecting rods in special bronze alloy offer economical and trouble free service.
  7. 316 stainless steel inlet and outlet check valves.

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Poly Diaphragm Pump DP-282.1-P

3 diaphragms. Through input shaft: 1″ diameter one end, 1-3/8″ 6-spline opposite end. Negative pressure – max: 4.9 ft; intermittent: 9.8 ft.

The DP-282.1-P features new and innovative DuraMax diaphragms. These diaphragms are “pre-deformed” and provide longer life and better performance with a wide range of chemicals. The plastic polymer provides great strength and long-lasting reliability. The diaphragm washer is made of stainless steel to prevent abnormal deformation of the diaphragm and guides it along the piston stroke. The piston crown has a friction-proof form to eliminate wear caused by rubbing.

Poly Diaphragm Pump DP-332-P

3 diaphragms. Through input shaft: 1″ diameter one end, 1-3/8″ 6-spline opposite end. Negative pressure – max: 4.9 ft; intermittent: 9.8 ft.

Poly Diaphragm Pump DP-448-P

4 diaphragms. Through Shaft: 1-3/8″ 6-spline both ends. Negative pressure – max: 4.9 ft; intermittent: 9.8 ft.

Poly Diaphragm Pump DP-555-P

5 diaphragms. Through Shaft 1-3/8″ 6-spline opposite ends. Negative pressure – max: 4.9 ft; intermittent: 9.8 ft.

Poly Diaphragm Pump DP-687-P

6 diaphragms. Through Shaft 1-3/8″ 6-spline opposite end. Negative pressure – max: 4.9 ft; intermittent: 9.8 ft.

Poly Diaphragm Pump DP-70-FP

The DP-70 series pump line is an all new compact 6.0 GPM spray pump capable of reaching an impressive 290 PSI. With its poly heads, it is ready to handle the harshest products on the market today. This series of pumps is available with a flange adapter (DP-70-FP), a gearbox (DP-70.1-GRP), and a gearbox and regulator so that you are up and running immediately (DP-70.1-GRIP).

2 diaphragms. Can be PTO, gasoline engine, or electric motor driven.