Just to share with you my self-made tank:
1. 25 litres tank - US$12
2. 12V Battery - US$8
3. CDC Connectors / Festo Filter / PU Coiled Tubing - US$30
4. Sullivan Pump - US$20
5. Trolley - US$10
6. Scrap wood and paint - Free
Total US$80, served me well and quantity more than sufficient.
Henry
Singapore
