Water Tube Diameter is 3/8"Made of brass with a lovely Verdi patina finish. This dramtic dolphin will be the focal point of your patio, pool or garden setting. It captures the playfulness of the real Dolphin. This fountain will be enjoyed for many years by all ages. Don't forget your pump to complete your wonderful new addition to your landscape. Pump is not included. On the right hand side of the screen there is add on items. You can order the BBPK320 pump kit. Pump Kit- 320 gph.