I have a Procal reactor complete with large bottle and regulator for sale. Great condition, no issues.
250.00 for the setup
Here's a link to the site:
http://www.marinetechnical.com/page12.html
Some features:
Features
22.5" high, base footprint 14 x 14"
1/4" cell cast tube
1/2" acrylic base and lids
High quality glass laboratory flowmeter
CO2 output to the sump
Heavy duty magnetic circulation pump
High quality needle valve for precise output control
CO2 bubble counter and check valve
Dispersion plate to dissolve media evenly
15 psi pressure gauge
Water input strainer
Adjustable input / output tubing bracket
Automatic CO2 venting assembly
Suitable for up to 700 gal aquariums
Swivel & slide water input tube for easy maintenance
Simple, no plumbing installation
User serviceable parts