Dura SIL 1000 NAPA #209515, best'izz rubber lube around bar none. A bottle last me a few years and I use it daily. You can add a drop to a 1/4" fuel line and push it on a 3/8' barb. You can EZ'ly push a 5/8' heater hose on a 3/4" fit'n. Add a drop to a fuel ta... Login to read more.