Bob's compressed air drain opener was a useful product, but after a few years I have run out of compressed air canisters. Does anyone know if the canisters are still available? It doesn't look like the product is still manufactured or supported. Amazon no longer has them, and a quick Google search hasn't turned up any information.
They are no longer available. Time to graduate to a kinetic water ram by gereral. http://www.waterram.com/