Graco Probler 2 Automatic Spray GunThe Probler P2 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 reduces maintenance, increases spraying uptime and is easy to use. For high output spray polyurethane foam and polyurea applications. Easy daily maintenance Responsive trigger action Easy to replace mix chamber insert