--Here's the thing: I want to have one 2" or 3" drop from an
overhead 4" duct, but I want the thing to be switchable; i.e. I'm
looking for a "Y" with a gate in it that closes off one side or the
other. Has anyone seen anything like this? Application is a couple of
grinders used in succession. Not enough suction when the vacuum is
split between them.

--
"Steamboat Ed" Haas : Bummed to be living in the
Hacking the Trailing Edge! : Golden Age of Bull****...
http://www.nmpproducts.com/intro.htm
---Decks a-wash in a sea of words---

I bought a 5" wye from www.woodworker.com for about $40.00. It has
integrated blast gates, I've NOT seen one that has different sizes on
each side of the wye with blast gates.

http://woodworker.com/cgi-bin/FULLPR...ARTNUM=892-519

steamer writes:

--Here's the thing: I want to have one 2" or 3" drop from an
overhead 4" duct, but I want the thing to be switchable; i.e. I'm
looking for a "Y" with a gate in it that closes off one side or the
other. Has anyone seen anything like this? Application is a couple of
grinders used in succession. Not enough suction when the vacuum is
split between them.

You can get Wyes that have 4" on the incoming and two 2" or 3" branches.
Just put a gate on each branch.

www.spiralmfg.net can make any size you want within reason. Spiral Mfg
has pretty good prices.

Brian Elfert