T-bolt clamps are the very best clamp money can buy. They are virtually impervious to harsh elements and are super-strong. If you want the best, use T-bolt clamps. Available in many sizes from 1" to 6"
100-720-1000, use with 1" hard wall hose
100-720-1060, use with 1-1/4" hard wall hose
100-720-1120, use with 1-1/2" Fuel Fill hose
100-720-2000, use with 2" Fuel Fill hose
100-720-2120, use with 2-1/2" Water or Exhaust hose