I am trying to find a commercial inspection/ hatch cover of the type typically found on working boats. I am in the process of bolting down and making the cockpit sole water tight and would like to install the inspection hatch into the cockpit sole so I can check engine oil and perform vavious other tasks without having to take off the whole sole.

Type of hatch would ideally be of cast aluminum, "Used" and have a twist handle allowing easy access.

I have just finished tapping threads into the stainless backer strips that the builder of our W32 had the foresight to install behind the raised flange that the removable cockpit sole rests on as well as all new rubber gasket. This allows the sole to very easily be bolted down and hopefully create a watertight seal with out the need for getting into the engine space and deal with attaching nuts. All that is required to easily remove the sole for larger projects is a rachet wrench and a couple of minutes of time. With that said I check my oil every time I start the motor and other items like the fuel distribution manifold have been all relocated to the rear bulkhead directly over the shaft and I do not want to have to unbolt the sole every time I want to take the boat out, a real PITA. So the idea is to get a good used small rectangular aluminum access hatch like found on commercial working vessels. One of the things I truly enjoy is finding quality good used equipment for the boat and have done this through the entire 9 year re-commissioning process with very good result, all that is usually required is a little patience.