I am interested in purchasing this RO/DI unit.
http://cgi.ebay.com/New-6-stage-100-...QQcmdZViewItem

Can somone tell me at the bottom there which of the 2 is the best/easiest to install for the feed devices?

There are 2 different Feed Water Devices:
Regular: 1 x 1/4" Needle Valve
http://61.220.188.82/items/Pic/22-01-P1.jpg
or Option A: 1 x Chrome 3/4" Tee with 1/4" Ball Valve
http://61.220.188.82/items/Pic/22-01-P1-1.jpg
Buyers can select one of two adaptors, only.

Thanks