55 gallon poly drum
Comes with a float valve at the top if you are planning on hooking up to a RODI system so you never have to fill manually. There is a push to connect bulkhead with a 6mm tubing fitting at the bottom. Simply attach the tubing to the other float valve in your sump to maintain the exact same water level at all times. This is a complete system. I also have the RODI unit if interested.