I went to the plumbing shop yesterday to pick up some 1 inch pex for my boiler install and they did not have any oxygen barrier pex. I have gotten some there is the past but now it is special order and $1.80 per foot vs. .85 cents per foot. This is for the 20' straight sticks. I only need about 120 feet so I don't care too much about the cost. What I need to know is if I should use the O2 barrier pex or is the regular stuff ok. This will be used from my pressurized primary loop. The guy at the plumbing shop said that you don't need o2 barrier pex anymore....I don't believe him otherwise they would not make o2 barrier.