3H/Seacon RMG-3-MP 3 Pin Male Rubber Connector - Buy Now!
Amazon.com: CNLINKO 3 Pin Power Industrial Circular Connector, Male Plug & Female Receptacles, Cable to Cable Connection, Outdoor Waterproof IP67, Easy Plug and Pull, AC DC Signal : Electronics
Valterra T1029-4 Termination Adapter - 3" Bayonet x 3" Male Thread - Walmart.com
Philippi Watertight 3-wire MOUNTED plug & Socket set with covers | Shop Marine A/C