A complete line of air operated pumps for oil, grease, ATF and fluids.

Diaphram Pumps
Air Operated Diaphram Pumps
Samson air operated diaphram pumps have many unique design features and benefits including, but not limited to the following:
  • Non-stalling spring assisted shifting air motor.
  • Non lubricated air valve.
  • Bolt together construction.
  • External air valve design
  • Self priming and variable flow rate.
  • Explosion proof.
  • 5 year warranty.
Samson air operated diaphram pumps are specially configured for service with most shop fluids. Choose any of the pumps in our range for:
  • Methanol windshield washer fluid
  • Ethylene Glycol base coolants (anti-freeze)
  • Propylene Glycol base coolants (Dex cool, etc.)
  • Waste oils (suction and pumping)
  • New oils, including synthetics
  • Water
  • Diesel fuel




Model PN-25 (2825)
1/4” Polypropylene pump designed to operate at low air pressure. Suitable for water, solvent and petroleum based fluids. Polypropylene pumps are an economical pump for water based liquids. 1/4” inlet and outlet.




Model PN-38 (2827)
3/8” Polypropylene pump suitable for nonaggressive liquid pumping applications. Very economical for water based liquids and slurries. Pump components resistant to abrasion and staining. 3/8” inlet and outlet.


Model PN-5 (2829)
1/2” Polypropylene pump ideal for most liquid pumping applications. Pump components offer zero water absorption and assure outstanding resistance to abrasion and staining. Pump comes with 2805 dual manifold. Simple bolt construction makes changing manifold easy. Dual manifold is used for mixing of fluids (water and antifreeze), (windshield fluid and water) or any two fluids where a 50/50 or 1:1 Mix ratio is required.



Model PN-5A (2829)
1/2” Aluminum pump ideal for multiple uses up to a medium viscosity fluid. Typical pump for lube service. Both waste oils and new oils.


Model PN-75 (2833)
1/2” Polypropylene pump ideal for most liquid pumping applications. Pump components offer zero water absorption and assure outstanding resistance to abrasion and staining. Pump comes with 2805 dual manifold. Simple bolt construction makes changing manifold easy. Dual manifold is used for mixing of fluids (water and antifreeze), (windshield fluid and water) or any two fluids where a 50/50 or 1:1 Mix ratio is required.

Model PN-75-UL (2834)
(Not shown) Same as PN-75 except UL listed.

Model 2807
3/4” Dual manifold set for PN-75 models (optional)



Model PN-100 (2835)
1” Aluminum general purpose pump for use of heavier fluids at faster flow rates. Designed to handle the tough jobs. Optional split manifold available for pumping two different fluids, or for equal volume mixing. 1” inlet and outlet.

Model PN-100-UL (2836)
(Not shown) Same as PN-100 except UL Listed

Model 2810
1” Dual manifold set for PN-100 models (optional)

Model Selection Table
  PN-25 PN-38 PN-5 PN-5A PN-75 PN-100
Air Motor Ryton® Aluminum Ryton® Ryton® Aluminum Aluminum
Wetted Section Polypropylene Polypropylene Polypropylene Aluminum Aluminum Aluminum
Seats Polypropylene Buna-N Polypropylene Aluminum Stainless Steel Stainless Steel
Guides Polypropylene Polypropylene Polypropylene Aluminum Aluminum Aluminum
Balls PTFE Buna-N Buna-N Buna-N Buna-N Buna-N
Diaphragms PTFE Buna-N Buna-N Buna-N Buna-N Buna-N
Air Inlet 1/4" FPT 1/4" FPT 1/4" FPT 1/4" FPT 1/4" FPT 3/8" FPT
Fluid Inlet 1/4" FPT 3/8" FPT 1/2" FPT 1/2" FPT 1" FPT 1" FPT
Outlet 1/4" FPT 3/8" FPT 1/2" FPT 1/2" FPT 1" FPT 1" FPT
Suction Lift 5' 10' 5' 5' 18' 18'
Capacity 3 GPM 6 GPM 15 GPM 15 GPM 28 GPM 49 GPM
Mounting Hole "X" 3-25/32" x 3-7/32" 5-25/32" x 3-5/8" 4-25/32" x 4-17/32" 4-25/32" x 4-1/8" 7-11/16" x 5-1/2" 8-3/3" x 6-11/16"





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