Good info, but looking at the line from the connection leading to and out of the water filter, the water goes to the filter then to the valve. That means the filter and lines are under pressure. aren't those lines plastic or are they pex?

I must admit, I have installed those plastic lines behind fridges... Home Depot and lowes sell them... surely they know what's best.... right? lol

What about the excessive length of the white plastic tubing also? Yes, we understand the need for back-of-frig access, but that looks like a good 4 to 6 feet ?!?

That invites kinks in the line when frig is slid up against the wall, thus creating another weak point for the great flood, low-no ice production over time, and H2O dispenser issues.

I have recently installed 2 of those plastic lines also that lowes and home depot sell. The Watt's brand type. I do understand the difference in durability but I had assumed since watts was selling the lines that they were made to withstand this type of water pressure and are most likely rated for a good amount of pressure. I am a newbie to appliance repair and the lines are fine and have been ok since the jobs were completed But after reading this I'm nervous about the lines that were put in and now I think I should go back and replace them with copper or the steel braided lines. I would not be that difficult to change them out. AM I being to anal about changing these two lines over to something better than the regular plastic line from watts now or do you think I should just from here on in stick to using copper or steel braided lines ???? Any thoughts on this would be appreciated

I wouldn't go back but change procedure going forward... but if either one bursts, flood the house damaging rare and expensive hardwood floors.. then forget all I said. lol.

The more I think about it, it is probably a good idea to have customers sign a waiver of liability form for water lines not provided by customer.

Thanks for the response and I will install different water lines from here on in.

Have seen John guest hoses develop a hole through no other means 

I see these lines coming out of the floor fairly often but the filter is normally mounted under the sink , but quite often in old 2 story houses it’s under the house which makes it tricky to shut off quickly 

we have seen issues with water lines run in ceiling spaces and springing a leak 

the other issue we have seen is being a metric country plumbers using 6mm hose to fit into johhn guest fittings which are 1/4 or 6.4mm so after a couple of years of water pressure and hose movement from each time the valves open and close they start to leak at the joints