Oil capacity options: 15 gallons or 20 gallons. Material: high‑impact polypropylene or steel (depending on model). Hose length: 8 ft or 8.2 ft. The main tank is constructed from high‑impact polypropylene (or heavy‑gauge steel, depending on model) for lightweight durability, and each unit includes an 8‑foot or 8.2‑foot draining hose for convenient fluid transfer.