This is how I Fill by HPA Tank. I have a Small Scuba Tank Compressor that will fill a tank up to 4500 psi. It takes me 6 minutes to fill my 48 cubic inch paintball tank to 3000 psi. I have a Bazooka Ball Rental Business where I rent out my guns so i have 18 tanks to fill and this compressor does the trick. How to Fill your Paintball Tank, How to fill your HPA Tank.