11-16-2004, 01:37 PM
I'm preparing to install a Laing SM 303 re circulation pump in my house. It requires a return line from the furthest away outlet. This is not a problem, but in that line I have to install a couple of cut off valves, a swing check valve, a hose bib, and an automatic air vent. No questions about any of the components mentioned except the auto air vent. I know what it is supposed to do, but where do I find one and what am I looking for specifically? My web searches have produced a number of vents, but some are only for heating systems, some specify non potable water, and I am a little confused by all of the choices. I'm sure you plumbers are acquainted with these devices. I'd appreciate a make and model of the appliance I should ask for.