Excellent 
Grommets (6mm, 13mm, 19mm)
Snuggly fit pipes through a drilled hole – use a Top Hat Grommet.
First push (the right size) grommet inside the hole, then feed the pipe through the grommet.
It’s a great way of connecting pipes to your tank or through a hole in any hard surface.
• For snuggly fitting pipework through drilled holes
• Chance of leaks is minimal
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