Rob, I think you can buy those inspection ports at any marine hardware store. All you have to do is cut a hole, drill the screw holes, put some sealant around, use self-tapping screws and your set.
Thanks. I have removed the tank from the boat and will be cleaning it. The only port I have come across are plastic. Will these be sufficient? Do they make Aluminum ones anywhere?
Plastic will work with diesel. That's what I use but you can have a shop make a oval plate that requires tapped bolts and a gasket. These aren't readily removable for inspections but are common. I've also seen a oval model that is pre-built with fasteners ready to go. I don't have the link though. Try google.
This is a heavy duty unit. You can use it on holding tanks, water tanks, or fuel tanks.I bought one for my holding tank, and it works great. But as I have said above, it is really heavy duty.
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