What is the size of the seal (o-ring) on a big block dip stick tube?

I figure I can go to Lowes and buy a package of o-rings for the price they was for one seal. They want $8.00 plus shipping for this seal.

Thanks
Bruce

Get yourself a little pack of AC Compressor rubber O rings. They come in an assortment of sizes and are "stretchy". They are also heat resistant. I bought a pack of 6 or 8 at O'Reillys for about 4 bucks. One of them will work for what you need. I found them near the 134 freon junk.

:beers: