The CLIFFON Circular Waterproof connectors are IP68 rates for underwater, outdoor and indoor application. They are also fire resistant V-0 and CE approved.
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27-9556 - CliffCon® 68 Series 2 Pole Female Plug
27-9559 - CliffCon® 68 Series 5 Pole Female Plug
27-9560 - CliffCon® 68 Series 6 Pole Female Plug
27-9562 - CliffCon® 68 Series 9 Pole Female Plug
21-14360 - M25 Cable Gland White 1/2 ~ 11/16 Inch Cable DIA
High quality nylon cable glands manufactured from Nylon 66 to UL94V-2, and are IP68 rated for weatherproof reliability and outdoor applications.
I have used MCM for many years and would give high recommendation for getting the job done right.