Ok. So here's a dumb one. So I have a 5/8 Heater hose nipple that I blocked off. Problem is I used those damn rubber caps and a hose clamp. While it looks alright, it doesn't last, starts to crack and leaks. And it doesn't seem to take verry long. Any better ideas? Something that's not big and clunky? Does any one offer a heavy duty one? Thanks fellas!