Four gallons of fresh water, mounted and ready. The OST Tank delivers clean water on demand wherever you go — no electricity, no complexity, just water when you need it.
Its shape unlocks a mounting option no flat tank can offer: installation along the sides of platforms, cargo baskets, and pickup canopies, maximizing space efficiency. And when you do have flat roof rack space available, it mounts there too, just like the Elite or Duo Tank.
Note: The OST Tank is designed for external use — rinsing, washing, and cleaning. Not intended for drinking water.
Mounts Where Flat Tanks Can't The OST's design allows it to be installed along the sides of roof rack platforms, cargo baskets, and pickup canopies — making use of space that a flat tank simply cannot occupy. It also mounts flat on standard roof racks, giving you full flexibility depending on your setup.
Gravity-Fed, Always Ready No electrical connection needed. Fill it up, mount it, and the OST delivers water on demand through gravity alone — no pump, no cables, no setup required.
Ready for Any Situation Rinse off after a session, wash your gear, clean your pets, or scrub your hands at any trailhead or campsite. Four gallons goes further than you'd expect.
360° Elbow Valve The outlet elbow rotates on all axes, giving you complete flexibility on hose direction regardless of how or where the tank is mounted.
Pressurization Option Need more flow than gravity provides? The optional valve cap allows manual pressurization up to 40 PSI for a stronger, more controlled stream when you need it.
Self-Pressurizing Fill The tank can be naturally self-pressurizes as you fill it (depending on the way you use to fill it) giving you immediate flow without any extra steps.
Built to Last UV-protected polyethylene construction — fade-resistant and built to handle years of use in any condition.
Dimensions: 66.9" L × 4" diameter
Shipping & Import Notice Price includes international shipping from Costa Rica to the US via DHL (3–4 business days). Based on our shipping history, approximately 80% of deliveries arrive with no import fees applied. In cases where fees do apply, they are determined by US customs and collected by DHL upon delivery — typically around $50. These fees are not controlled by Oasis Tank.
