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By certification 
Manhole
Manhole Covers can be bulkhead mounted, or on deck with the flush version. With ring and with coaming. Normal size: 450x350, 600x400, 700x500. Available in steel, aluminum or 316C stainless steel.
Various gasket types available.
Flush cover normal size: 494x394, 620x420, 720x520
Different type: Flush bolted, Flush Clean out, Flush screw, Flush stud, Raised bolted, Raised clean out, Raised stud.
Manufacture Standard: CB/T19-2001, DIN83404, NS6261, NS6262, NS6263
All Class society certificate: DNV-GL, BV, LR, NK, KR, IR, RMRS, RINA, CCS
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