Dripless HR300 High Ratio Caulk Gun. This is not your run-of-the-mill caulking gun, it is heavy duty and beautifully engineered. The HR300 features a 26:1 pressure ratio that makes it impressively smooth to operate and allows the user to finely control the dosage of any 185ml caulking tubes. 

Features:

• High ratio specialty gun, fits standard caulk cartridges, including our 185ml "Zillas"
• 26:1 thrust ratio
• Fully rotating barrel
• Built in seal punch
• Twin gripper plates for long wear
• Adjustable screw to cut thrust gaps