o rings for speed/ temp sensor

[diverphil]

hi, does anyone know the part number or where I can get replacement o rings for an air mar speed/temp sensor The part number on top of the sensor is 20-399-01 I've tried svb and they cant help.
attached is a pic of it,
regards
Phil

[SorinCT]

O-ring sets may help. Next tine you pull it out measure OD and thickness. Should match up with something from the set or you can find some misc seals on the web. It's a static seal so not so critical on material (viton, gp rubber, etc). Have a look at the plug for reference.

[Rampage]

Best bet is to remove the sensor and measure the o ring and then go here https://simplybearings.co.uk/shop/All-O-rings-and-kits/c4747_5572/index.html?page=1 and buy the o ring to match.  You’ll need a micrometer to measure internal diameter and the diameter of the ring material.  Very good service from these folks in the past in terms of delivery.  As already said, no need to worry about what the rings made of, just find one that matches for size.
I usually buy a slightly smaller one, one to the size I measured and a slightly larger one in case of measuring errors. 

[diverphil]

will have a measure up of the ones on the plug next time i go down.
thanks
phil

[Moodymike]

Search eBay for Airmar spares, have to get impeller as well.