Posi-Products™ Wire Connectors (for 18- to 20-gauge wire) 3 Posi-Tite™ waterproof connectors at Crutchfield
9010E Red Scotchlok Wire connector and tap for 18 - 22 gauge wire
Nilight 3Pin Electrical Wire Connectors Male and Female Plug Socket Quick Disconnect Waterproof Plug and Play Wire Terminals for Automotive Cars Trucks Motorcycles Marine Boats, 2 Years Warranty - Walmart.com