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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
Volume (L) 0.3
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 8pm Mon-Sat (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 Rapid Dose 300ml is rated 5.0 out of 5 by 5.
Rated 5 out of 5 by from Does exactly what it promises !! A little sceptical as to wether it would work to cure pressure drop on my boiler but added to my system and now no pressure drop. 5*
Date published: 2019-11-01
Rated 5 out of 5 by from Does the job Had a leak on my heating tried anouther make didn't work this one did good very good product
Date published: 2019-10-28
Rated 5 out of 5 by from It worked for me I’m not normally one for writing reviews but I am so relieved this stuff worked that it would be rude not to! So.... last week we discovered a small leak on an old copper pipe which was in a really awkward place. We tried using the putty but it didn’t stop even though it claims to work under water. After a good few hours of researching our heating system (we are not plumbers) we apprehensively decided to try this. It was fairly easy to use as we put it in the radiator directly before the leak. Within an hour it appeared to have reduced the amount of water leaking and within 12 hours we knew it had stopped completely. To say we were relieved is an understatement.
Date published: 2019-10-27
Rated 5 out of 5 by from Good product Bought this 2 weeks ago worked perfectly
Date published: 2019-09-19
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