I'd go back to McMaster and check their part # 3184K1, which is silicone and crush resistant (probably ok for minimal vacuum). Another option would be their #5393K41... it's PVC but rated for vacuum. Dig deeper there, you're bound to find the right thing.

<marv>

Colyn Case <colyncase@earthlink.net>:

I'm looking for a minimum thickness vacuum hose just to hold the dukes
pressurization valve open on takeoff.  Right now I have a 1/4" i.d. .64" o.d.
big fat rubber line.    I don't see anything on McMaster Carr that is thinner
wall.  But given it probably needs to handle maybe 10 psi of vacuum, the big
fat rubber hoses seem like overkill.

I was thinking something like the dh instruments dh400 might do but they seem
to have been acquired by Fluke and Fluke doesn't seem to be selling the hose
anymore.

Any suggestions?

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