Cheap DIY waterproof connectors

Just wanted to share my design for waterproofing bullet connectors, since I didn’t see anything quite like it on these forums.


Each side has a hose barb adapter and some adhesive-lined heat shrink. The middle is flexible vinyl tubing (0.5" ID.)

Overall this is a very low-cost solution (About $2 total, not including the bullet connector) and seems to work quite well.

The parts I linked are compatible with 8-10 AWG (8 AWG needs the fitting to be drilled out slightly) and up to 8mm bullet connectors. I’ve tested it with 8mm and 6mm (XT150) bullet connectors.