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CNC 121/122 Emergency Relief Manhole Cover
Emergency pressure or pressure and vacuum relief manhole cover, with dead weight loading up to 23.5" WG pressure or nominal 3.5" WG vacuum. Fabricated steel base with aluminium or cast steel cover. Alternatively in stainless steel.
Available in 10", 18", 20" or 24" sizes.

CNC 171 Manhole Cover
Non-sparking gas tight manhole cover provides easy access to all types of low pressure tanks or vessels.