Model # F13XAD

Internet #100118939

Store SKU #806938

Store SO SKU #1000091823

null 1-1/4 in. x 3 ft. Fiberglass Pipe Insulation

1-1/4 in. x 3 ft. Fiberglass Pipe Insulation

$763 /each
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Product Overview

The Thermwell Products Co. Inc. 1-1/4 in. x 3 ft. Fiberglass Pipe Insulation tube safely covers 1-1/4 in. pipes directly exiting water heater or furnace. The pre-slit and self-sealing tube is easy to install.

  • For steam heat system or next to furnace or water heater
  • 1/2 in. thick, for 1-1/4 in. pipe
  • Pre-slit, self-sealing tube
  • Fiberglass with reinforced foil



Maximum compatible pipe size (in.)
Product Depth (in.)
Product Height (in.)
Product Length (in.)
2.75 in
Product Width (in.)


Accessory Type
Compatible Pipe Material
Insulation R-Value
Minimum compatible pipe size (in.)
Pipe or Fitting Product Type
Product Weight (lb.)

Warranty / Certifications

Manufacturer Warranty

More Products With These Features


Customer Questions & Answers

What is the diameter of the hole in this insulation?

Are you basing the description of the pipe, as in the ID is 1 1/4" while the OD is 1 1/2"?
Asked by: glenn32
The product description indicates this is for 1 1/4 inch copper pipe. I installed it on 1 1/4 inch copper supply/return lines for in-floor, radiant heat. The insulation fits loosely on the pipe (thus providing an air gap to help with insulating the lines.
Answered by: Sittinback
Date published: 2015-11-06

what is the thickness of the walls of this insulation..... 1.25" x 3' x???

Asked by: Anonymous
The wall thickness of this product is 1/2"
Answered by: WeatherstripExpert
Date published: 2015-11-06

How many in a case? 11/4" type

How many in a case? 11/4" type
Asked by: Diy
there are 12 pieces in a case.
Answered by: WeatherstripExpert
Date published: 2017-01-04

what is the temp rating for this product

Asked by: hydro
It is rated to 250 degrees.
Answered by: WeatherstripExpert
Date published: 2016-04-02
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Customer Reviews

1-1/4 in. x 3 ft. Fiberglass Pipe Insulation is rated 2.9 out of 5 by 7.
Rated 2 out of 5 by from Bad tape It's insulation, right. What can be bad about insulation. As other reviewers have said, the tape on this product doesn't work. Day after installation, it will open up. Don't buy t
Date published: 2016-12-20
Rated 5 out of 5 by from gets the job done. fits perfectly around 3 Inch pipes and stops the sweating of pipes. should use gloves and long sleeves cause insulation is very itchy when it comes in contact with skin.
Date published: 2016-08-23
Rated 1 out of 5 by from Garbage After getting rid of the all the asbestos insulation headed to HD for some replacement - just about fell over at the price, but had to get it. Then after spending a day in the basement installing them I was VERY DISAPPOINTED to come downstairs the very next morning to see all the adhesive failing and the foil literally falling off the pipes..... pure garbage, but i am stuck with them as they are paid for and installed. Now I have to find a way to get some type of high temp white paper tape to hold them together...... avoid at all costs
Date published: 2014-11-16
Rated 3 out of 5 by from Does the Job Read the other 'poor' reviews before purchasing and have to agree with most of what was reported. Product DOES go on easily and once you develop a technique for getting the self-adhesive seal to work the job goes more quickly ...BUT the adhesive is poor and will come apart so take the advice of another reviewer and use 'cable ties' or good duct tape at the ends of each unit. I used duct tape to join the units together and this eliminated the 'paper separation' issue. I used this product on in-floor, radiant heat copper supply lines so I do not get temps above 115 degrees. ...and did NOT have any problem with the insulation coming apart due to high temperatures. I DID like that the fiberglass was easy to trim/fit around pipe joints and between pipe hangers. I did like that the insulation opened for easy installation (take care not to spread it too wide as this may cause the insulation to come apart and may cause it to separate from the paper sheathing. I installed 70 feet and YES, I thought it was quite expensive ...more than it's counterparts on the shelf. But I did NOT want foam insulation and opted for the fiberglass. I tried the 'wrap-type' first. It was inexpensive but it DID NOT WORK well. Took it back and got the product being reviewed. Expensive, yes. But it is doing the job and over the long run it will pay for itself by reducing heat loss from the boiler supply line. DO WEAR gloves as the fiberglass will get on your hands/wrists with the typical results of handling fiberglass. Since I was installing this above my head I also wore a hat/glasses and face mask.
Date published: 2014-11-26
Rated 1 out of 5 by from Home depot pulled the oldest most dirty insulation pipes they could find. Home depot pulled the oldest most dirty insulation pipes they could find. terrible online experience.
Date published: 2012-08-17
Rated 3 out of 5 by from so-so product The product is easy to install and cut, but a few problems: - the adhesive fails at high temps. if using to insulate steam pipes, use cable ties - some of the fiberglass tubes come out of the paper wrapping fairly easily. handle with care - why is this product so expensive? wish it was a little cheaper.
Date published: 2014-01-03
Rated 5 out of 5 by from fiberglass pipe insulation Wear googles and long sleeves to prevent getting fiberglass in you eyes and on your skin. Respirator mask is a good idea too. Nice to have tape to seal seams. Be sure to order good quality tape to seal ends so fiber is not exposed.
Date published: 2014-12-10
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