Pneuaire seems to have several websites selling their reservoir cartridges (
www.smcpneumatics.com,
www.coastpneumatics.com,
www.poweraire.com; they share the same "online support" image and similar addresses). Their other websites indicate that the RC2.5x10 is actually ~30 cubic inches. But when 8 of these tanks requires 7 minutes to fill, the difference between 30 and 44 doesn't seem like much. =P
For their full product line and their current stock, check out here:
http://www.coastpneumatics.com/searc...&key word=RC2