The Roughneck Vari-Flow Heavy-Duty Sealant Gun easily switches between a thrust ratio of 121 and 251 for exceptional power with minimum force. The non-drip selector is ideal when working indoors or at height to avoid spillage. The rotating barrel and comfortable rounded grip ensure maximum control and reduce fatigue. Quick-release mechanism and hook end for easy cartridge change. Suitable for cartridges up to 400ml.