In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
i have seen osv valve on several outside tanks in wood shed enclosures. the state says not to put them on where there is freezing. these rooms dont seem to have any problems with freezing oil lines etc. webster says they can go in temps. of 32 degrees and webster says 0 degree. i dont use the valve in these situations but i am curious about the application. i am a tech. thx for any commments.