I use a valve at the junction of a no-hose canula and my oxygen hose that I use to buy from softhose. Now that they have retired I can't find a source for some more. Does anybody know if someone has continued making these and if so how do I contact them. Thanks
You might want to check out some of the Aquarium supply businesses. They have a large selection of valves and connectors that are used to supply air to aquariums and several that I've seen were even calibrated or provided a calibrated output. Many tubing sizes were available and the prices are very reasonable. You might want to get a few of them and see if they will work for you.