On Thu, 10 Jul 2008 09:16:19 -0400, "Ed Huntress"
wrote:


"John Miller" wrote in message
om...
I'm working up a demo model of a special purpose pump (sorry I can't be
specific about its' function). and need to find some appx 3 inch dia X
1/4W acryllic tube.


Someone may prove me wrong here, but I can't see extruded acrylic tube being
round enough for a good seal.

Yes, I'd avoid extruded tube. McMaster carries cast acrylic tube which
should be good enough, depending on the the compliance of the seal.
Easiest way to find out is to buy a piece.

8486K557
(Same as 8486K555)
Clear Cast Acrylic Tube 3" OD X 2-1/2" ID, 1' Length
In stock at $23.88 Each.

--
Ned Simmons