Loctite55 Pipe Thread Sealant, Non Curing Thread Sealant for Plumbing Pipes and Fittings, Reliable Fast Action Pipe Sealant for Metal and Plastic, 50m

After failing with PTFE tape + LS-X & various washers on an outside tap (probably because when it was straight it wasn't tight enough) half a dozen turns of this produced a weep free perfect seal. Expensive, but pretty idiot (me) proof.

Good stuff better than ptfe tape, couldn’t stop a drip from an all new sink waste system tried every which way, eventually with persistence the cord did the trick

This is string and alternative to tape

I wish I had discovered this thread sealing cord earlier. It works very well and is easy to use.Unfortunately, the sticker Amazon places for their stock code obscures the usage guidance, so be careful to refer to the website if you can't peel it off successfully. The key is using the correct number of turns related to your pipe diameter, and in winding each turn across the thread rather than within the thread.I just knew it was going to work as I tightened each joint - a smooth resistance, which became higher as the end of the tightening approached. I particularly like the way a sealed joint can be re- orientated (for example, to align a tap) after assembly without losing watertightness. If you need to remove a joint, it's easier to clean the threads of this cord compared to PTFE tape, or sealing gunk. It's an updated version of the old plumbers' standby, hemp fibre.You get a lot of cord in the dispenser for the money, so I consider it decent value for money. Switch to this and you'll never go back to PTFE tape.

Don't get me wrong ptfe tape does have its uses, but over the years it seems to be getting thinner and thinner.After having a leak on both radiator tails I had just installed I searched for an alternative.Hey presto loctite 55 is here.Straight away after installing what appeared to be a small amount (7 to 8 turns on the thread) I could tell it was NEVER going to leak. A very reasureadly tightness that you just don't get with ptfe.No drips, weeps or puddles after walking away.Superb and a 50m roll should last me a lifetime!

Being in industry for 45years and using different thread sealers and ptfe tape over the years for different applications. This is a game changer for low/medium pressure threaded (BSP/NPT) fittings compared to PTFE tape. Obviously ptfe tape will still have a place in many applications, as will other Loctite thread sealing products, but for the most part (domestic), after you have used this, you won't go back. Follow the guidance on the product, you don't use much and apply it randomly. Initially you may think "that won't seal", but it does! and unlike ptfe tape, the fittings can be 'adjusted' slightly if needed. Search on 'U-tube' for the Loctite video if unsure how to use it.

Provides a much better seal than PTFE tape. I was able to seal 3/4 BSP dog legs with just three full turns of the fitting.

Reviewed May 2023:Bought this after a recommendation from a YouTube channel on the best ways to ensure compression joints are totally sealed and he was using this stuff.Although regular PTFE is pretty cheap for a roll, its usually for 12 metres or so. (thats still a lot of pipes that can be sealed!). This loctite cord is 50 metres, I'm thinking this will probably last me the rest of my lifetime if I don't loose it.This is cord, not flat tape.. one lesson as that its not necessary to have tape flat (how much time and frustration has been spent in the past!).In the case of compression fittings, its a case of winding about 7 turns on the pipe below the olive (once the olive is in place from an initial tightening). Then, when tightening up, the cord is compressed under the screw fitting and against the olive. Its very tidy, with no cord/tape on show, and I had a 100% first time success rate of zero leaks!The casing has a cutter, which is helpful because it means you can cut it off one handed, and its red in colour which helps when trying to find it after putting it down.I'd buy this again if I run out or loose this reel.