PRODUCT SAFETY NOTICE: LAP Floodlights More Information

Sentinel Internal Leak Sealer 1Ltr Product Code: 99730

Internal Leak Sealer for small inaccessible leaks and weeping joints in all types of indirect heating systems including those containing aluminium components. Compatible with elastomers.


  • 1 Year Guarantee
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Safety Data Sheet
Additional Information
Technical Specification
  • Brand : Sentinel
  • Product Type : Internal Leak Sealer
  • Volume : 1 Ltr
  • Pack Size : 1
  • Manufacturer Guarantee : 1 Year Guarantee
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

Click here to see information on our delivery charges and times



Hopefully you won't need to return an item, however, if you do, it is our aim to make this as simple as possible. By following the guidance below you can help us to help you when a product is not what you expected, or is faulty. Your statutory rights are not affected by this guidance.


Click here to see information on returns and cancellation

€17.95 Incl. 20% VAT

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Sentinel Internal Leak Sealer 1Ltr is rated 4.8 out of 5 by 55.
Rated 5 out of 5 by from It works Finally managed to cure the loss of pressure in the CH system with a double dose.
Date published: 2019-02-01
Rated 5 out of 5 by from This is brilliant! The pressure in my boiler has been dropping every day for the past 6 months and my plumber recommended I try sentinel. I was certainly sceptical but seems to have fixed the leak and the the boiler has been fully pressurised for the past 2 weeks! One happy customer!
Date published: 2018-12-27
Rated 5 out of 5 by from Seems to work. Leak from 35 year old compression joint disturbed during boiler replacement in unpressurized system, about 100 cc per day. Put in at 7 pm via a towel rail with top access using funnel, leak had stopped by following day. Still Ok after 48 hours. Reliability rating is really a don't know yet.
Date published: 2018-12-20
Rated 5 out of 5 by from Good product Seems to have done the job. Time will tell as I have only used it a few weeks ago
Date published: 2018-12-08
Rated 5 out of 5 by from A life saver Was a little unsure whether this would work as it was quite a drip in a virtually impossible piece of pipe work to fix without taking up a tiled floor. Worked a treat and couldn’t be happier as it saved a lot of drama so would deninantely recoment!
Date published: 2018-12-02
Rated 5 out of 5 by from Great Value A great product, easy to follow instructions. Good price.
Date published: 2018-10-07
Rated 5 out of 5 by from Well worth it I used 2 bottles of this in a newly refurbished rental property, the system was loosing enough pressure each week to shut the system down with no leaks evident. It took a day or 2 to circulate properly and start working. That was 6 months ago now & I haven't had to even top the system up 1 time. Worked perfectly for me
Date published: 2018-06-28
Rated 5 out of 5 by from Successful last ditch attempt Before calling in insurance claim for a leak detection company (some pipe work under tiled floor which couldn't be accessed) finally tried this product. There had been a steady slow reduction in pressure of .3 bar every week. Large house but was able to isolate which area leak was happening. Added 2 litres and ran hot for two days then opened up remainder of house heating. Leak stopped! This was 4 months ago and so relieved that I thought the product worth promoting.
Date published: 2018-05-30
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