A new replacement for P-26 packs containing larger volume pump. All new packs will have the light button and air control. If this is to replace a Hydromate purchased after 2017, ask about the P-31C Model with threaded connectors as well as Syntex vinyl colors. Call if you are not sure, or have any questions. Note: Please be patient; delivery times can be 12 weeks or more from the factory. You are welcome to call in this order with only a $500 deposit and pay the balance later.