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SureShot

Best thing for sealing plastic thread?

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SureShot

Hi all

 

I have a 350l tank with it's outlet to the pump at the bottom. This outlet is a 'female threaded' outlet and is plastic as it's part of the tank - the male connector which screws into it is also plastic. When the tank is full this outlet leaks slowly, as if it isn't tight enough, but it is. I have used silicone sealant and putty around around the outside in an effort to "block" the water from coming out but to no avail. I hear PTFE is not meant to be wrapped onto plastic thread, so what do you use?

 

Thanks

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P4dstar
8 minutes ago, SureShot said:

Hi all

 

I have a 350l tank with it's outlet to the pump at the bottom. This outlet is a 'female threaded' outlet and is plastic as it's part of the tank - the male connector which screws into it is also plastic. When the tank is full this outlet leaks slowly, as if it isn't tight enough, but it is. I have used silicone sealant and putty around around the outside in an effort to "block" the water from coming out but to no avail. I hear PTFE is not meant to be wrapped onto plastic thread, so what do you use?

 

Thanks

PTFE worked for me, used quite a bit. If it really worries you then just buy a brass connection and use it on that.

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SureShot

That settles it then, thanks guys!

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Part Timer

There is a liquid that plumbers use now, unfortunately I don't know what it's called

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P4dstar
1 minute ago, Part Timer said:

There is a liquid that plumbers use now, unfortunately I don't know what it's called

Flomasta liquid PTFE. I don't like it but I imagine it would work nicely. If it was to pop out inside the tank you would need to get in and clean it up though.

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NoName

Sureshort, not sure where you got that info from, I've used it.. no issues but would dsay important to make sure both threads are clean and not cross threaded etc and then just PLENTY of PTFE to ensure you've got both threads fully filled to allow for expansion/contraction/movement...if it still leaks just wrap a few more times around until it stops...

 

Bedtime reading...nothing about not to be used on female plastic joints...😁

https://uk.rs-online.com/web/generalDisplay.html?id=ideas-and-advice/ptfe-tapes-guide

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Pjj
11 minutes ago, Part Timer said:

There is a liquid that plumbers use now, unfortunately I don't know what it's called

 

 

Liquid ptfe blue in colour ?.. screw fix sell it 

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scottish cleaning service

Boss white jointing compound but you might not be able to unscrew it later on.

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Apw1210
On 10/01/2020 at 21:02, SureShot said:

Hi all

 

I have a 350l tank with it's outlet to the pump at the bottom. This outlet is a 'female threaded' outlet and is plastic as it's part of the tank - the male connector which screws into it is also plastic. When the tank is full this outlet leaks slowly, as if it isn't tight enough, but it is. I have used silicone sealant and putty around around the outside in an effort to "block" the water from coming out but to no avail. I hear PTFE is not meant to be wrapped onto plastic thread, so what do you use?

 

Thanks

 

Plumbers Mait or gas type PTFE 

 

Just remember... whatever you use to seal it with be sure you have a inline filter before your pump

 

An expensive oversight by many as it kills your pump 

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clearview

I have a plastic ionics tank with a pure freedom 90 degree plastic union screwed in so I used the liquid paste stuff as didn’t want to split anything by wrapping ptfe tape round it. As long as everything is bone dry when your assembling you’ll be fine. 

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