Invert Tube Backnut

  • Item #E47
  • Price: $2.99
- +

In stock, will ship on Saturday, April 1

A William's exclusive, this is made of food grade nylon, custom-molded to include an integral backnut. Keeps beer (and yeast sediment) out of the Transfer Valve during fermentation. Fits our E39 Transfer Valve, or any valve with 3/4” tapered male pipe threads. Made in USA.
Average rating 10 out of 10 ( based on 8 reviews )

Good idea!

Review by david toler on 4/23/2022

I really like these backnuts. I have found that it's necessary to tighten the nut onto the thread of the spigot by just one turn at the most. I use the nut that comes with my spigots; the backnut is just to keep the trub out of the spigot. I have noticed that more than one turn makes the backnut get very difficult to remove from the spigot, so it's a maximum of one rotation for me.

Great idea well executed.

Review by Ben Hall on 9/28/2019

Bought these backnuts to go with a few new valves I bought here at Williams. I love these right angle nuts - they do keep trub from settling inside the valve...but will siphon up some trub when the value is first opened. That's fine - I put the first few ounces that come out into a container I'll toss away...and the rest is trub free! I have these on all my brewing buckets. :)

invert tube backlit

Review by Dan on 9/6/2016



Review by Jason on 6/5/2013

Great idea and works well.

Backnut is a good nut.

Review by George on 1/14/2013

Bought a handful of them to replace my transfer valve standard backnuts. They work great. The backnut can be reused if a bucket is junked.

Dec 09, 2018 by Doug

Q: the invert tube pointed up left about 3" of beer (above the yuck). Is it supposed to be pointed down? I have an older Williams kit and the fermentation bucket hole is about 2.5" above bottom of bucket. Seems like a waste of beer.

A: Yes, it is designed to be pointed down. When pointed down and the valve is not opened, it stays dry and free of yeast sediment during the ferment, and then when you open the valve, it acts like a siphon tube very close to the sediment on the bottom of the fermenter.

Nov 07, 2018 by Chris

Q: Does this fit the 6 gallon Vintage plastic carboy?

A: No. The threads on the vintage shop valves are different.

Nov 06, 2018 by Frank

Q: Does this works with the brewers edge ?

A: No, it does not fit.

Aug 13, 2017 by Harry Anderson

Q: Is the opening pointed vertically (12 o'clock)?

A: It is pointed where it ends up after tightening. It should be at 6 pm for proper use.

Mar 29, 2017 by MIKE GORDY

Q: What does this do and how does it get installed. Not much information or pictures of item in use.

A: This is usually used on a bucket style fermenter to keep beer (and yeast sediment) out of the Transfer Valve during fermentation with an elbow bend. On our Siphonless fermenter it screws on the inside on the back of our valve but can fit on any valve with 3/4” tapered male pipe threads.

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