Quick-Connect and Simple Compression Fittings for Water Filtration Equipment
The two fittings styles can be interchanged without a problem. If your undersink unit uses Jaco fittings and you want to replace one or more fittings with a John Guest style, there’s no problem. There is, however, one essential rule you must follow: Jaco fittings must always be used with a tube insert, and tube inserts are never used with John Guest or Mur-lok
To connect Jaco Fittings, back the nut onto the tube, insert the tube insert as far as it will go into the threaded body of the fitting, then screw on the nut. Tighten it as tight as you can get it with your hand, then take one more complete turn with a wrench. No more than one. Over tightening will eventually result in a leak.
With John Guest style, be sure that the tube is cut squarely, then push it into the fitting until you feel it hit bottom. It’s done. If you need to remove the tube, be sure that all pressure is off the fitting, push in on the collet with your thumbnail, and pull the tube out. Remember that you don’t use a tube support with quick connect fittings.
Tubing used for filters and reverse osmosis units is always measured by its outside diameter. Undersink reverse osmosis units use 1/4″ OD tubing, and some units use a mixture of 1/4″ and 3/8″ tubing.
- Above is a clear plastic model of a Mur-lok quick connect fitting. The white insert is called the collet. Note that it has two o-rings. Most quick connects have only one.
Reference Source: Pure Water Products
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