Buy PG9 Cable Glands Pixel Store
Pack of 25 – PG9 Cable glands used to keep pixel controller and prop enclosures waterproof while allowing cables to pass through. These are rated IP68 and come with the O-Ring that makes these waterproof.
PLEASE DO NOT BE TRICKED INTO BUYING CABLE GLANDS WITHOUT THE O-RING. THEY ARE CHEAPER, but without O-Ring the cable gland loses its IP68 rating.