Pro Water Tank holds a capacity of 42L (11.1 gal). Made of food-grade polyethylene and is BPA-free. The Mounting System features an articulating strap that securely mounts the water tank to your roof rack. Water tank can be easily removed for use at ground level. Add the WTAN059, featuring a 1/2'' BPS thread that fits the Pro Water Tank and other 1/2'' fittings. The WTAN059 is lockable with the Small Accessory Lock RRAC134 for added peace of mind. Additional accessories RRAC170 and WTAN054 (tap included), sold separately, are compatible with your 42L Pro Water Tank.