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Product Details

Ideal for sealing small leaks or weeping joints on all types of indirect central heating systems. Easy-to-administer solution and will not cause blockages within the system.

Technical Specification
Brand Sentinel
Safety Data Sheet click here
Type
Volume (L) 1
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£10 £5 Free


Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 9pm Mon-Fri (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Reviews
Sentinel Leak Sealer 1L is rated 4.7 out of 5 by 18.
Rated 5 out of 5 by from Sealer Early results appear to show this has done the job!!
Date published: 2020-02-09
Rated 1 out of 5 by from Did not work Used for a slight drip on radiator fitting but did not stop even after adding second tube had to call in plumber to fix leak
Date published: 2020-01-24
Rated 5 out of 5 by from Great service arrived next day. Bought last week should do what it is designed to do.
Date published: 2020-01-22
Rated 5 out of 5 by from Sentinel leak sealer Had a weeping leak in boiler water jacket so added leak sealer and it stopped very quickly. I realise this is probably a temporary solution but it gives me time to sort out a new boiler.
Date published: 2020-01-18
Rated 5 out of 5 by from Best price around It seems to work. Pressure back to normal
Date published: 2019-12-18
Rated 5 out of 5 by from Worked for me Had a slight leak around the lockshield valve, and didn't fancy draining down. As we have a large system with very long pipe runs it took two and half litres, but it did the job. Good price from Toolstation
Date published: 2019-12-11
Rated 4 out of 5 by from It worked Dosed my radiator system about 3 weeks ago to stop a leak at a joint that was difficult to access. Filling was easy to do via a top floor towel rail radiator. So far so good. No identifiable issues with the other components such as thermostatic radiatior valves. How permanent the job is remains to be determined hence the 4* rating.
Date published: 2019-12-09
Rated 5 out of 5 by from Very Happy Did the job just fine..quality
Date published: 2019-12-05
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