O ring sizes for radiator valves

bsr · 14 Jul 2019

Hello, do you know what size the o rings are, which are used to seal the bleed valve and blanking cap against a radiator or towel rail? Quite often when I take these off (eg to add inhibitor) they come off in bits.

I've found an o ring chart with a size 19 which is as follows. Does that sound right?
ID 20.3mm
OD 23.9mm
Diameter 1.8mm

Alternatively Ebay has 20mm x 2mm.

ianmcd · 15 Jul 2019

just use PTFE tape

bsr · 15 Jul 2019

Ah OK is that the standard bodge? Do I roll it into a sausage as a face seal or use it on the thread like radiator tails?

ianmcd · 15 Jul 2019

Its not a bodge and will last a lot longer than the cheap O rings that come with the plugs, I do both as you describe start with a few wraps on the thread then roll it a few wraps to make a face seal, never had one leaking, seen many O rings splitting on rad plugs

bsr · 29 Jul 2019

Done, seems to be working well. Thanks.

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O ring sizes for radiator valves

bsr

ianmcd

bsr

ianmcd

bsr

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