Boat-Ready White Round Non-Slip Inspection Hatches - Sizes 4", 6", 8" with Detachable Cover - ABS Plastic Screw Out Access Hatch Cover for Kayak, Yacht, Marine Accessories White

I needed a hatch to route a 6" A/C hose through then close it off tightly when not in use. This marine screw out hatch should be just what I need. SS screws included! Good Job!

The quality of the plastic and O ring is decent and gets the job done. One major disappointment is this is listed as 6-in, and technically it's 160 mm, which is 6.29 in. It may not seem like a big deal until you go to install it. A standard 6-in hole saw will not work. You will have to devise another way to cut the hole or buy a metric hole saw. I'd also like to see bolts with nuts, as opposed to screws. I guess it depends on what you're installing this into, but in my case, it's a plastic tank, and the screws provided don't provide much bite. This would not be an issue if you're going into a different substrate or thicker material, so something to consider. You're going to end up spending $3 or so on extra hardware if you want bolts with nuts.

Going to put this in the top of barrrel