Horobin’s multi-lock steel test plugs offer strength where it matters –at the compression points, multiple compression points around the perimeter of the plug enable the seal to expand in localised areas. These plugs are fitted with handle bars to make it easier to locate the plug in the pipe and come with "instructions for use" label on each plug. The steel components are aluminium coated for better corrosion resistance. Chemical resistant seals and "double seal" plugs can also be supplied. These multi-lock test plugs can also be supplied with twin outlets –lower outlet allows complete emptying of water from the drain before removal of the plug.