Tajima 96838 CNV-RS Convoy RS Sealant Caulking Gun with a Barrel Body and Duel Power 8:1 and 16:1 Thrust System 310MLAre you looking for a Caulking Gun for smooth application of decorators caulk, sealant, and other adhesives? Would you prefer both 8: 1 and 16: 1 ratios? Do you work with 310ml cartridges? This mastic gun has professional grade Barrel Caulking Gun design suitable for working with a wide range of different viscosities and with excellent performance even in cold temperatures. Made to world leading standards this Tajima Gun has a Duel Power switchable