Product review (5 stars): Samsung Perfect
Fit easy - Install Easy Came Quick
WARNING buy in single packs... Doubles cost more than two singles.  The company may not understand bulk packaging and reduced prices... It must cost them more to send one at a time -- but we save because they have not figured that out yet.  I ordered two because the search was confusing before I bought -- so I didn't want to do this again in 6-12 months.
FYI recommend changing every six months or 300 gallons.  NOTE you can stretch this.. but if you find them DIFFICULT to remove, that means you are getting calcium or lime build up at the connection (Mineral build up) and this means at one point the replacement may not fit properly due to build up.  So be careful about penny wise dollar foolish.  ALSO, after you install the directions say run for six minute (Apx 1 gal) NO WAY... they just want you to clear the line and air bubbles -- stand back after you hook up and push button... first two pumps will burst out with air -- after about 2 glasses -- you are all good.