I removed the lazerette OEM Bomar hatches because of regular leakage from rain, sea, and washdown on the Bomar, and installed this same deck access hatch pictured in the post for "The Hawk is here,'" known to me as manufactured and distributed by Imtra Marine. As I recall, the Bomar require some work to remove, with care given to avoid damage to the gelcoat, and there was some filing to get the correct fit for the new hatches, and some new drilling to match the deckplate pattern of the Imtra hatch.
Imtra recommends use of silicone sealant so the plasic is not weakened. Both hatches were replaced in two hours.
Flawless performance over the last 6 months in sea, rain, and washdown - no leakage at all.
Hope this helps.
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http://www.imtra.com )