Just throwing a feeler out there. I use liter meter doaser's. Love em but the replacement tubes are priced crazy !! 20 bucks a piece plus s&h so roughly it cost about 25 a piece. When you run six pumps that adds up every six months. So the big question is does anyone out there have a connection that ya could buy this surgical tube in a roll ?? It,s 1/4 id x 7/16 od brown surgical tube. Tx.