You could try something like this: https://www.amazon.com/Waterproof-Restmo-Weather-Resistant-Housing/dp/B07WL7D9V6/ref=asc_df_B07WL7D9V6?tag=bngsmtphsnus-20&linkCode=df0&hvadid=80470624769013&hvnetw=s&hvqmt=e&hvbmt=be&hvdev=m&hvlocint=&hvlocphy=&hvtargid=pla-4584070153298595&psc=1
Or pack several wires into one of these: https://www.bluesea.com/products/1003/CableClam_1.40in