Buy PG9 Cable Gland Your Pixel Store
Pack of 100 – PG7 Cable glands used to keep pixel controller and prop enclosures waterproof, while allowing cables to pass through. These are rate IP68 and come with the O-Ring that makes these waterproof.
PLEASE DO NOT BE TRICKED BUYING CABLE GLANDS WITHOUT THE O-RING. THEY ARE CHEAPER, but without O-Ring the cable gland loses its IP68 rating.