Pump Chamber Form: NEW - top seam with fixed core. Hydraulic release with 3 inch tapered walls. Has flat lid former and built-in electric vibrator in inner core. Tank poured right side up. Finished tank dimensions 5' x 5' x 4' tall (ID). 3 inch walls. Will hold 6000 gallons - total capacity with 500 gallon liquid and 9" air space. Can customize to fit length and width if needed.