Very true. Found out the hard way trying to seal my filler hose to gas tank with my original tower clamps. I've been living with fuel leaks for 28 years when filling er up. Never thought it was the dang clamps. Finally bought some turbo charger clamps that provide a 360 seal. I filled up my bird on the second notch fuel pump and had zero leaks. Would recommend these clamps to anyone replace their fuel filler hose or had experienced leaks at filling up. I am a happy camper now.