The Hatsan TactAir Fill Tank 98 cu-in volume fills up to 4500 PSI. The included fill valve is equipped with both a tank pressure and fill pressure gauge, along with a quick-disconnect fill whip. A Hatsan fill probe adapter is also included for use with Hatsan PCP airguns. The tank fills by way of a male quick-disconnect on the valve body with no need to back-fill through the hose. This compact portable tank is great for all-day air gunning!