Sentinel Leak sealer, 1L

Product rating
5.0 out of 5 stars
Product code:
5016402052788

Current price

£14.50 was  £15.70

you save  £1.20

Sentinel Leak sealer, 1L

Product code:
5016402052788
Sentinel Leak sealer, 1L

Current price

£14.50 was  £15.70

you save  £1.20

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  • Home Delivery Order by 7pm (4pm Sunday) for next day delivery
  • Click & Collect 1 hour Click & Collect - Select store

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Product Details

Product Information

  • Seals inaccessible leaks and weeping joints internally

Features and Benefits

  • It can make better use of resources to repair rather than replace items

Technical Specifications

Technical specification of Sentinel Leak sealer, 1L
Brand Sentinel
Container size 1L

Health and Safety

Please note that this item has additional safety or regulatory datasheets available. The product may have possible health and safety hazards covered in these documents. Refer to the container for full information and always follow the instructions.

Alternative product

Plumbsure Central Heating Leak Sealer Concentrate, 310ml

Product code:
03888377
Product rating
0 out of 5 stars
Current price
£15.27

Help & Advice

BTU Radiator Calculator

Our BTU (British Thermal Units) calculator will help you to work out the heat requirement for your room, and recommend the number of radiators you will need to comfortably heat it.

What is a BTU?

A British Thermal Unit (BTU) is a measure of heat output from a radiator. Depending on the size of your room, the number and type of windows and what the room is used for, you'll need more or less heat. If you have a higher BTU requirement, it might be better to use more than one radiator to deliver the heat you'll need to a room. The total BTU output of several smaller radiators may meet your needs.

How do I choose the right radiator?

The BTU value of all our radiators is clearly labelled in-store and online, helping you find those which suit your requirements.

Step 1: Which room you are heating?
Step 2: What are the dimensions of the rooms?
Are you measuring in metres or feet?:
Length of room

Please enter the length of your room in your chosen units (metres or feet)

Width of room

Please enter the width of your room in your chosen units (metres or feet)

Height of room

Please enter the height of your room in your chosen units (metres or feet)

Step 3: What type of windows or doors are in the room?
Select all that apply:

Step 4: View your results

Your BTU result

How to guides

How to understand a plumbing & heating system

How to understand a plumbing & heating system

Your home's cold and hot water supply systems will largely be out of sight, with the pipes concealed in walls and under floors. But knowing what type of system you have and where you can find everything is very important for maintenance work, making improvements and, most of all, dealing with emergencies.

Reviews 5.0  out of 5 stars

Sentinel Leak sealer, 1L is rated 5.0 out of 5 by 2.
  • y_2018, m_8, d_14, h_6
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_2
  • loc_en_GB, sid_5016402052788, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_diy
Rated 5 out of 5 by from Working well My old Worcester 24cdi was dripping from the expansion vessel , losing pressure every day . I added sentinel leek stopper to a radiator and over the next few days the leak was almost non existent . I'd imagine that over the next few days it will stop altogether . Highly recommended
Date published: 2017-12-17
Rated 5 out of 5 by from Stopped pulling in air. After fitting a new bathroom the boiler started to bang and I was having to bleed air from the system every few days! I looked everywhere for a leak that might be pulling air where I had made alterations but couldn't find any obvious leaks. Rather than lift every floor to find a leak that didn't seem to be dripping water I tried this product. Its been over a week now with no boiler banging and when the bleeds are opened there isn't any air! I recommend this product for any one that has a leak that doesn't appear to exist!
Date published: 2015-01-20
  • y_2018, m_8, d_14, h_6
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_2
  • loc_en_GB, sid_5016402052788, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_diy

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45 day returns policy

Arrange collection or return to store.
Customer support team - 0333 014 3357

Free delivery on standard orders over £50

Excludes Large and Bulk delivery

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