Don’t use a coupler; the sharp tapered edges, designed for an olive can cut into the rubber washer. Use a hexagon nipple which has a two flat faces. You could always file down the coupler if you don’t have a nipple. 👍🏻

Brilliant video thanks for the wonderful videos they are all so well documented. Your certainly the best plumbing advice on u tube . Don’t ever give up posting these your vast experience is priceless.

They are you could argue the best plumbing invention ever.I have uses them for years without issue other than as you say the isolator variants which are not reliable after time.

Very good advice Al.👍👍👍👍

I love these flexi-hoses. I use a lot of push fit ones aswell.
Example:- Last year I plumbed a kitchen sink (hot & cold) + 2 cold feed dishwashers & a washing machine, all in a line in around 2 hours, going through 4 base units.
In copper, the job would have taken 12 hours & knackered my back.

I removed as many of these flexis as possible since our bathroom plumbing is tank fed. So I wasn’t sure if this video was sarcasm or not 😂. For mains and combi systems, these are great

Great happy video, as usual, Al 👍

Another great video. Many thanks.

Good video.  Hope you, Jan and Mo are well

More top tips from the expert

love these videos

you have 245 views but thats not really views its people helped. these kind of videos are a great force for good argument for youtube

One of these sprung a leak under my sink. I was very lucky as it happened just before I was leaving for work. I'd recommend if you fit these to inspect them every now and again for rust and other damage.

I don't like using couplers or normal compression isolators the sharp edge cuts into the washer, it does generally work but the washer is then goosed and if for whatever reason the flexi is removed in future and the washer not replaced could lead to problems.

They have moved on a bit, ten years or so ago they were prone to splitting, seems less often now, just don't kink as Al said and all should be well.

If you double the length, as you described, the flexi now has a compression fitting at both ends.

On my bathroom sink the flexi got damaged by the plug lift mechanism, one of those ones where you push a knob and it lifts the plug up. Flexi pipe would move when turning the water on and off and rubbing on the bar of the mechanism. It damaged the mesh and the rubber inside started to protrude and there was a pinhole leak which I caught in time. Moved to a toggle sink plug now. Got to make sure these pipes don't rub against anything in use.

They're ok til the washer fails.......usually in an inaccessible place

I've never seen one of these close up, how does the flexi connect to a copper pipe?

Can you use these on the bottom of towel rail radiators? Ive put them on but worried about bursting?

Thanks for the video.
If a flexi is described as 15mm x 3/4  what does that mean? (I assumed it meant a 15mm copper pipe one end and a 3/4inch fitting the other end... And how does it all relate to the diameter of the tail pipe of a tap to which you're attaching the flexi to?)