Since this is RCM, I would go to Boeing Surplus and buy a piece of
aluminum about 3/4 or 1 inch thick and maybe 1.5 wide and as long as
you want the sight gage.
Mill a groove in it and cover it with some lexan also from Boeing
Surplus. Attach the lexan with screws. Who says that sight gages have
to be round or a glass tube.

Dan


Grant Erwin wrote:

http://www.tinyisland.com/images/airDrain.jpg

This looks really cool to me. Not only that, but I have nearly
everything
I need to make it. Except the sight glass. Anyone know how such a
sight
glass might be made (or purchased) and installed on a biggish pipe
nipple
like the one in the picture?



Grant Erwin
in soggy W. Washington