Edelbrock part 8461 hose clamps have a unique maintenance - free design retain tension and never needs retightening. Plus, they're easy to install and only require an ordinary heat gun. Simply place the clamp over the fittings and hose, then apply heat to seal They are ideal for preventing leaks on out - of - round applications and conform to any shape of hose, housing or fitting. These hose clamps are made from a heat - sensitive thermoplastic with a memory to prevent over - or under - tightening. Can be used with all brands of silicone hose and are temperature rated from - 40 Deg F to 302 Deg F.