Review on Qibaok Waterproof Electrical Connectors - Automotive & Industrial Applications by Greg Floyd

These butt connectors are very good, 4 stars only because there are better sealed connectors on the market but at a much higher price. The great thing is that there are a few sizes that you won't typically find smaller or larger. Heat shrink tubing works well and should be a durable connector that is decently weatherproof.