Masterflex Pump for Calcium Reactor

[chase888]

Been searching eBay for this pump and don't know what I found would work or not for this purpose. Could you guys help?

I got the following to select from:

1. http://www.ebay.com/itm/Cole-Parmer-...:X:RTQ:US:1123

for $175 plus shipping

2. http://www.ebay.com/itm/Cole-Parmer-...EOIBSA:US:3160

for $125

3. http://www.ebay.com/itm/Masterflex-C...EOIBSA:US:3160

for $200 plus shipping

Which one would you guys recommend?

TIA!