Moira Niedzwiecka Posted April 19, 2018 Share Posted April 19, 2018 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? Link to comment Share on other sites More sharing options...
MikeSharp01 Posted April 19, 2018 Share Posted April 19, 2018 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? Link to comment Share on other sites More sharing options...
Pocster Posted April 19, 2018 Share Posted April 19, 2018 Ask Wallace ! Sorry , couldn’t resist ... ? 1 Link to comment Share on other sites More sharing options...
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