Sentinel Leak Sealer Rapid Dose 300ml

By Sentinel Product code: 37472 Pack size: Each

£13.98 Exc. VAT £11.65

Delivery Address
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Collection Address
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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

Covid-19 Update

  • FREE Next Business Day delivery is available for orders over £25 for orders placed before 9pm Mon-Thur and before 6pm Sunday
  • Saturday and Sunday delivery is available for orders placed before 6pm on Friday for Saturday Delivery and 4pm Saturday for Sunday delivery. Items over 30kg can only be delivered next Business Day Mon-Fri. Orders placed after 9pm Thursday will be delivered the following Monday see here for details
  • Pre-12 delivery service is now available for weekday deliveries. Place your order before 9pm Mon-Thur for next business day delivery by 12pm. Orders placed after 9pm Thur and before 6pm Sunday will be delivered by 12pm Monday. UK mainland only
  • Once your order has been dispatched you will receive an invoice email with the courier details and your tracking number
  • Alternatively go to MyAccount, click on your Order History, click on the TRACK icon to link through to the carrier website and the tracking details for your delivery
  • Delivery direct from suppliers is available and specific delivery times will be displayed on the product page
Order Value: Under £25 Over £25 but less than £75 £75 & Over
Next Business Day Mon-Fri (order by 9pm Mon-Thur & Sun by 6pm) delivered before 6pm £5 Free Free
Pre-12 Delivery Mon-Fri (order by 9pm Mon-Thur & Sun by 6pm) delivered before 12pm next day £10 £5 £5
Remote areas standard delivery (2-4 days) £5 Free Free
Saturday Delivery (order by 6pm Friday) delivered before 6pm £10 £5 Free
Sunday Delivery (order by 4pm Saturday) delivered before 6pm £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

Covid 19 Update

Click & Collect

We are fully open and delighted to welcome our customers into our branches.

Our opening times are 7am-8pm Monday-Friday, 7am-7pm Saturday and 9-4pm Sunday

Our speedy 5 min Click and Collect service remains one of the safest ways to buy from us and minimises your time in store. Place your order at 7 days a week, and travel to store once your collection confirmation is received by email or text message.

Don’t forget your mobile number – Please ensure that your mobile number is added so that we can text you when your order is ready to collect.

Your items will be held at your selected Toolstation branch for 14 days, after which point your order will be put back to stock and refunded automatically.

Sentinel Leak Sealer Rapid Dose 300ml is rated 4.5 out of 5 by 10.
Rated 5 out of 5 by from Quick, easy and effective Incredibly easy to put into the heating circuit. Sealed mine first time
Date published: 2020-06-30
Rated 5 out of 5 by from Works Bought just before lock-down as worried about a leaking solder joint. Easy to apply and worked a treat - no more leaks
Date published: 2020-04-05
Rated 5 out of 5 by from Does what it says on the tin Bought this to hopefully slow down or stop a pressure leak in my system...It certainly slowed it down. Ive been told I may need to add a second dose.
Date published: 2020-02-25
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 Sealer Bought this as tried everything else works great.
Date published: 2019-11-22
Rated 4 out of 5 by from Appears to work I tried Toolstation for the first time, as this product was out of stock at several other similar suppliers. It is easy to apply, once you have gone online and read the instructions, as only limited instructions on the bottle. The tricky bit, if adding to a radiator, is removal of the application tube. Even though the radiator valves have been closed, there is enough residual pressure to squirt a little of the additive about 5ft or so, so you need to be dexterous with a wet cloth and fast when replacing the bleed valve. Best also to get the little black sealing bullet in the back of the tube to the bottle end at the start, as it can stick slightly in the tube. You will also need to cut the tube nozzle to be a precise fit to the bleed valve, otherwise any slight misfit under pressure causes leaks. The instructions on line could be a little better as the text is numbered but the related images are not.
Date published: 2019-11-21
Rated 5 out of 5 by from Amazing product This stuff is incredible but don’t expect an instant fix. I applied this directly to a cold radiator and then set the heating to come on. The boiler was still losing pressure and so I kept topping up to 1.5bar every time it dropped. The product needs time to cure but needs circulation so keep the pressure topped and then all of a sudden it took. The pressure jumped and has stayed constant
Date published: 2019-11-18
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
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