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Malone Specialty Inc. offers Carbon Steel Metric Hollow Hex Plugs, as well as 316 Stainless Steel Metric Hollow Hex Plugs, in various sizes. This item comes with an Elastomer, or Form-E seal, and is to used for a port application purposes only. It will NOT seal on a DIN or Standpipe style connection. For more information see below, or contact one of our experienced salesmen at (440) 255-4200.