Fix-A-Floor Easy to use Heavy Duty 10:1 thrust ratio Professional Sealant Caulking Gun. Ideal for use with Fix-A-Floor but also ideal for other sealants and adhesives. Designed for use with 310 ml cartridges, the sealant caulking gun is perfect for use with low-viscosity materials and offers easy dispensing with a thrust ratio of 10:1 - Also comes with a hooked end for easy storage in-between uses.Whether caulking around windows and doors or along kitchen sinks, bathtubs, floors and more, the This caulk gun is a handy addition in the bag for plumbers, contractors and other professionals, as well as homeowners and DIYers alike!.