I bought a Stenner SVP1 pump from a local reefer. It was working before he took it off but for the life of me I can't figure how to get it to work. I even bought 5 new Santoprene Replacement Pump Tubes. It could need a new head or I just don't know how to use it. Regardless, I am going with a different pump to dose my Calcium reactor. Since I don't know for sure it is working or not I would like to trade it for some frags. Pick up in Berkeley or Oakland.