Help—Neptune Flow Sensor Leak

[nickkohrn]

I have two flow sensors; one 1” for my return and one 1/2” for my UV sterilizer. I haven’t had any issues with the 1” on my return, but I cannot get the 1/2” on my UV sterilizer to stop leaking.

I used RectorSeal No. 5 on the 1/2” flow sensor because it has threaded ends. I’ve had to take the flow sensor off and reapply the sealant more than five times, and I’m now frustrated. Both sides of the sensor, where the white PVC fittings thread onto the sensor, are where the leaks occur.

Below is an image of one of the leaks.

What else can I try? I’m ready to forego the sensor at this point because it’s been nothing but an annoyance and a waste of time.

 

[kevin_e]

Try good ole teflon tape

 

[ca1ore]

Are you using the BSP adapters that came with the sensor? If not, I second trying Teflon tape ….. and put a lot on.

 

[nickkohrn]

Are you using the BSP adapters that came with the sensor? If not, I second trying Teflon tape ….. and put a lot on.

Yep; I’m using the white adapters. I’ll give the tape a try.

 

[ca1ore]

Then wrap the %&#@ out of it.

 

[nickkohrn]

I wrapped the threads in tape, and it's been holding for ~15 minutes now. Thanks for the suggestions about the tape!

 

[Sleepydoc]

Go to the hardware store and get some non-hardening thread sealant. Better and more reliable than teflon tape for threaded PVC connections.

 

[nickkohrn]

Go to the hardware store and get some non-hardening thread sealant. Better and more reliable than teflon tape for threaded PVC connections.

Unfortunately, that’s what I initially used; RectorSeal No. 5 is a non-hardening thread sealant.

 

[scriptmonkey]

Then wrap the %&#@ out of it.

Dude, that made me laugh for some reason. Not like a little chuckle, but wife looking at me and trying to decide if I need to be committed laugh.

 

[Jstn]

Glad I found this thread, I had the same issue with rector and pastes, finally Teflon tape which everyone hammers against worked to stop my leak. I think the tolerance between the coupler and the sensor are too large.

 

[coreytrv]

Same issue across all my flow sensors 2" version.

FINALLY after 3 tries, got them to stop leaking. Here's what I used:

Non-hardening thread sealant. Screw in, then back out so it's in the threads.
Wrap with about half a dozen revolutions of teflon tape.
Add another coat of thread sealant.
**Added an oring on both sides of the sensor.
Wrenched down with a pipe wrench to compress the O-ring.