Probler P2 Spray Foam Gun

The Probler P2 Spray Foam Gun:

The Probler P2 Spray Foam Gun is lightweight and easy to maneuver – even in difficult spraying positions. Its double piston design provides more than 300 pounds (136 kg) of triggering force – much more than a smaller piston diameter. The Probler P2 Spray Foam Gun reduces maintenance, increases spraying up-time and is easy to use.

  • Allows use of additional accessories
  • Alternate side block hose routing
  • Allows filters to be easily removed


  • Easy daily maintenance
  • Responsive trigger action
  • Easy-to-replace mix chamber insert
  • Anti-crossover design virtually eliminates possibility
    of material entering the air piston
  • Ergonomic handle and balanced design

With all spray foam guns we recommend to have at least two onsite. This will assure the applicator always has a back up while the helper rebuilds a gun that may be clogged or crossed over. Keeping the Graco Spray Foam gun cleaned, greased, and well maintained with a good set of O-rings will prevent down time and should be taken very seriously.

Various output and patterns can be achieved by swapping the mixing chambers as needed.  We recommend only using OEM replacement parts with the Graco Spray Foam Guns, as off brand parts may cost less will cause many problems that lead to down time.

There are a variety of other guns that are available for various types of spray foam and polyurea applications. Graco Fusion AP, Graco Fusion MP, Graco Fusion CS, Graco Gx-7.

The Probler P2 Spray Foam Gun trigger actuates a small valve in the gun handle that controls the flow of air into the piston assembly. When the trigger is pulled, air flows through the valve to the front of the piston. Air pressure forces the piston towards the rear of the gun, simultaneously closing off the purge air and
moving the mixing chamber to a position where the mixing chamber orifices are aligned with the orifices in both the side block seal and check valve assemblies.

The proper alignment of the orifices is determined by the setting of the adjustment nut, located on the piston lock assembly. This adjustment nut determines the length of travel of the air piston and has been preset at the factory and should not require adjustment.

The two fluids (isocyanate and polyol) then flow through the material shut-off valves, seal, and check valve assemblies and into the mixing chamber. The two fluids impinge against one another and exit the mixing chamber in a swirling,
conical spray pattern. When the trigger is released, the mixing chamber returns to its original position and purge air flows into the mixing
chamber housing. The front tip o-ring, keeps air purge inside the gun head, forcing all of the air through the orifices in the mixing chamber, for a complete, total and constant

This purge air continues to flow through the mixing chamber until the air switch is pulled up to shut-off all air to the gun; or until the trigger is pulled again.



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