For sale is a ( lot of 6 ) USED , INSPIRO 4500 air supply gauges ,,These came from a local fire company auction .. I have no clue nor any info on them ,, You are buying them cheap and AS IS.. Should be tested before using .. ..LOOK AT THE PICTURES .. There are 6 in a lot for one price .. There are 3 lots available .. ..VEIW OUR OTHER AUCTIONS