Product review (2 stars): No locking hold on tube
The input port for the 1/4" tubing does not lock the tube in place.  The line pressure was enough to push it out, causing a lot of water damage.  I eventually had to hold the tube in place by using a cable tie to tie it to the sink tie.  Watts no longer carries an adaptor that uses a compression fitting for the 1/4" line for a more secure connection.