I have a Gylcerine filled speedo that leak out.........I didn't even realize it was filled with fluid until I removed the tightening ring that seals the gauge.
but before I send it out I'm going to try to refill it myself, is there a special type of glycerine to use?...............anybody done this before?......Thanx

I have refilled mine before. Purchased the Glycerine from a pharmacy.

Just pickied up an 8oz. bottle of 100% Glycerine from Walgreens for $8.00.................Thanks Scippy

Definitely not nytro glycerin. Hah.

Make sure you leave a small bubble at the top to allow for expansion in the heat.

Will do.............thanks