Question 1

I am looking for Y connector that I can turn off the supply to Bedroom and open the living room supply?

Accepted Answer

For us, this only functions as a splitter that we both use i.e. in bed at night he has a canula, I have a canula from one machine..  You might look for something with a little valve on it?

Question 2

I'd like to have a manifold to connect to one conentrator that would accomodate three lines, one to the kitchen, one to the bedroom and one to the den

Accepted Answer

Have you tried a fish tank manifold like this o e here on Amazon?  Kangkang@ Stainless Steel Aquarium Fish Tank 3 Ways Manifold Air Pump Splitter Lever Control Switch Valve Taps Aquatic Accessories

Question 3

Is there some kind of shutoff valve available so I can have a long and a short canula connected at the same time but only have one flowing at a time?

Accepted Answer

Not that i have found, I looked at and purchased several valves online none were of use. To keep from changing canulas & tanks, here's what I purchased & built. 
From amazon I purchased: 
(1 ) uxcell 1/4 PT  (2) way air manifold, this has 5 ports.
(1) uxcell air 1/4 pipe plug fittings pack of 5.
(1) #0007 oxygen supply tubing from westmed.Comes in a Pack of 5.
-----'
Went to plumbing supply store & purchased ,(1) Teflon tape role, (4) 1/4" PT barbed Hose fittings, (4) oxygen tank wrenches. This way  I use the regulator to turn the tanks off & on  with out removing them from the bag. Hope this helps, good luck.

Question 4

Im on high flow oxygen and have 2 concentrators. I need something that will connect the two tubes into one cannula. Would this work?

Accepted Answer

We (my husband and I) each have a concentrator.  We used this connector to join his cannula and mine, thus ending up with one tube we ran upstairs and then used a splitter to separate the one cannula into two again, one for each of us.  I believe this should work fine for you.

ASIN	B005JXGGNI
Best Sellers Rank	#621,479 in Health & Household ( See Top 100 in Health & Household ) #258 in Oxygen Therapy Products
Brand Name	AG Industries
Color	Transparent
Connector Type	Wye
Customer Reviews	4.2 4.2 out of 5 stars (270)
Item Weight	4.54 g
Manufacturer	AG INDUSTRIES
Manufacturer Part Number	FHSH749
Material Type	Transparent Plastic
Model Number	FHSH749
Number of Packs	1
Number of Pieces	1
Thread Type	NPT
UPC	653020241283
Unit Count	1 Count

RESPIRATORY CONNECTORS "Y" Oxygen Tubing Connector, each

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