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Advice about grommets please


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I am a bit confused about which rubber grommets to order.

The ducting is 125mm.

Most of the grommets I have seen are for 100-120mm or 120-150mm.

Which size should I get?

Also, I need a really good exterior sealing tape to seal under the windows & doors before the cills are fitted.

I was looking at bitumen tapes, any recommendations?

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120-150 as the 100-120 probably wont stretch. If you can get a 'returns' possibility buy one of each and return the one that fits best. If you can get the 120 to stretch, without tearing, then it will be a tighter fit but the 120-150 should be fine.

 

Ho wide a tape are you looking for?

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