How to Connect John Guest Fittings


See the diagram above to connect push in style John Guest fittings. Detailed instructions below.

To Attach Tubing

  1. Push tubing straight in, as far as it will go. (image 1)
  2. Tubing must be inserted past o-ring and hit backstop. (image 2)
  3. Pull tube to ensure it is secured.

To Release Tubing

  1. Push in grey collet to release tubing. (image 1)
  2. With collet held, put tubing straight out. (image 2)


Low Flow Out of Reverse Osmosis


I just replaced the filter on my APRO5500 system and it continues to have a significant decrease in output. It starts out with a normal flow but quickly decreases to a trickle. If I turn it off for a few minutes, it will have significant flow again but significantly decreases as before. Do I need to contact a plumber or a reverse osmosis service company?


Before calling a plumber or service company, try these steps:

Why is the Hole in the Side of My RO Spout Leaking?

The Question:

Why is the hole in the side of my RO spout leaking?

The Answer:

A water leak from a reverse osmosis system's faucet relief hole is a frequent issue, known as an air gap leak. Often, when water leaks from this area it is an indication that your RO's drain tube is clogged or blocked. When food or other debris plugs the drain line it prevents the water from entering your actual drain. However, this is a pretty easy fix.

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