Margarita Texas discusses the Grindmaster Crathco 3311 Frozen Beverage Dispenser.

Grindmaster 3311 Frozen Drink Machine*
Single flavor frozen beverage dispenser
Restaurant grade design, components, and capacity
Efficient refrigeration system with powerful ¾ HP compressor
Convenient illuminated fast flow dispensing valve

Designed for higher volume needs
Refrigerated liquid reservoir keeps up to 5 gallons of mix ready to freeze
Frozen chamber keeps 1.5 gallons of frozen product ready to serve
Frozen chamber automatically fills from liquid reservoir as product is dispensed

http://www.margaritatexas.com (less info)