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2" DIY Bulkhead:
1x 2" Male PVC electrical conduit terminal adapter. $1.50 (noticed the price went up but still roughly a dollar if you buy a case/bulk)
1x 2" Female PVC electrical adapter. ^Same cost as male fittings usually.
1x 331 size O-ring, your choice of material. Buy bulk packs on amazon, as low as 20-30 cents a piece Can get neoprene, silicone, buna-n, EPDM, etc
Also can make 1, 1-1/4, 1-1/2, and even 3 or more inches. Price varies on size, but still super cheap. I been making them like this for years now, never have leaks. Work best on a flat surface.