Pump Type: Siphon, HDPE/PVC. The FDA-approved, BPA-free HDPE barrel is tough, durable, 55 Gallon Closed Head Water Barrel, which is available in a range of blue shades. 55-Gallon Barrel: Closed-top HDPE barrel with two 2” bung holes (1 NPT, 1 buttress ), BPA-free and FDA-approved.