This US company makes excellent fuel tank inspection in several sizes. They have a clever design that allows easy installation in an existing tank, a good template for drilling holes and very good instructions. I installed an 8" port near the fuel pick-up unit and a 6" port further down the tank, past the central baffle, in my 32-3's tank.
Seabuilt - Access Plate Systems
www.seabuilt.com
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