Heyco, Strain Relief/Cord Grip, 3/4″ NPT for 2 Enphase Q-Cable + #8 ground, Qty. 1, 18-M3234GDA-SM
The 3/4″ version of these Heyco cordgrips provides liquid tight entry for up to two Enphase Q Cables .24 x .38″ (6,1 x 9,7 mm) and an additional .130″ (3.3 mm) diameter hole for a #8 solid grounding cable, and utilizes a skinned-over technology so any unused holes will retain a liquid tight seal.
They are IP68 rated and made of nylon construction with TPE sealing glands that resist salt water, weak acids, gasoline, alcohol, oil, grease, and common solvents.