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Weldless Flex Sightglass
Weldless Flex Sightglass

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Our Price: $25.00

Quantity in Stock:62

Product Code: FLEXSIGHT-L

Flex Sight Calibration Options:

This sight glass or level indicating accessory takes the guess work out of determining how much liquid is in any of your hot side brewing vessels. It is most commonly installed in hot liquor tanks to measure strike and sparge water volumes, but is also very useful in boil kettles to measure pre and post boil volumes.

While weldless systems have gotten a bad rep amongst homebrewers, this design is different. When installed per instructions, the unit is 100% guaranteed not to leak the first time and any time you reinstall it (no leak reports in at least 5000 units sold).

Our new Flex Sight kit will work for converted kegs or pots.


  • One pair of stainless steel machined elbow barbs with matching weldless bushings for installation at the bottom and top of the pot, keg, or tank. Note that our current version of this kit uses red silicone orings as the seals to the kettle and the elbow threaded face has a machined groove to keep the orings from slipping out of place.
  • One 24" length of high temperature silicone tubing
  • Pair of hose clamps
  • Choice of orings or stick on decals for calibration. Note that stick on decals can be applied directly to your keg or kettle, but if you are heating on an open flame, the lower numbers will melt off. This option is best used for electric vessels. For the orings option, you'll get three larger orings to mark 5,10,15 gallons and then eleven smaller rings to mark each gallon in between. IMPORTANT NOTE: The numbers you see in the picture are a little different than the ones we include in this kit. We include the same numbers as the other sight glass kits with the smaller arrows that run under the number.

Install instructions:

Drill two 1/2" holes in the pot or keg, one at the bottom and one at the top. Avoid putting the hole too close to any curves, welds or other obstructions. Hint: Use a framing square to ensure that the holes are directly plumb or "inline" with each other. It is important not to drill the holes too large. You want the male threads of the weldless bushings to just barely make it into the hole. The max OD on this thread is .52" which is just over 1/2". Drill a 1/2" hole and then just remove the burrs with a file and you should be able to get the bushings through.

The bushing goes through the hole from the inside of the kettle, out. Then roll the red oring over the threads on the OUTSIDE of the kettle. Then thread the elbow on. Generally you can get a seal by tightening by hand. If not, just grip the bushing with a pair of pliers and snug the elbow a little more. If you put the oring on the inside of the kettle, you will absolutely have leaks and we'll make fun of you when you call about leaks.
Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 15 Click Here to Write a Review »

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  0 of 0 people found the following review helpful:
5 of 5 Super easy to install and looks great December 21, 2020
Reviewer: Miguel Zavala from Villa Park, IL United States  
I love this thing, it was much easier to install, functions just like it should, and looks great!

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  0 of 0 people found the following review helpful:
5 of 5 Great Product May 18, 2020
Reviewer: Kyle B. from PA  
Leak free install only tightening fittings by hand. Used a sharpie on the tubing to mark level lines vs. the decals. Nice to be able to flush out level tubing when cleaning the kettle.

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  0 of 0 people found the following review helpful:
5 of 5 Some differneces in product configuration. March 13, 2018
Reviewer: Jeffrey Watson from Issaquah, WA United States  
The video shows an early prototype. Washers versus o-rings and machined grooves. It still seals well.
However, the product is good.
What might help is an explanation that the o-ring level measurement option is not very permanent. That is to say If you touch it them the setting is changed. I purchased the O-rings and the decals. Over time I will see which one I prefer.
No leaks!

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  0 of 1 people found the following review helpful:
5 of 5 February 4, 2018
Reviewer: Dan Howell from Gridley, CA United States  
Thank you for great products. I like to use things before reviewing.

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  1 of 1 people found the following review helpful:
5 of 5 Satisfied October 21, 2017
Reviewer: Peter S. from New Richmond, WI United States  
Installs easily, takes the heat. Needed to stretch the tube a little to keep it from sagging when it heats up. O rings are ok but felt tip marker is easier to read. Get it wrong, its simple to replace the tubing. Having the upper fitting feed back into the kettle is good idea. Would buy again.

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