P&H, NDK (now SKUK), TideRace, Current Designs, Swift et al use Kajak-Sport hatches - not to mention obviously Kajak-Sport itself.
Necky, Impex, North Shore, et al (including Valley) use Valley hatches.
Up until recently NDK used Kajak-Sport for main hatches and Valley for day hatch. They now use Kajak-Sport for day hatch as well.
Heel and Pegpads™
Hardshell Kayak Sail Rigs
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