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The Plumb Thumbs Radiator Capping Tool by Grakob is a dual-ended, hand-powered tool designed to simplify radiator removal by sealing 15mm and 22mm pipes. It prevents water spills, reduces mess, and protects radiators from rust, enabling faster, safer maintenance with minimal system repressurizing.


| ASIN | B0721YL264 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 1,506 in DIY & Tools ( See Top 100 in DIY & Tools ) 15 in Central Heating System Accessories |
| Compatible fastener range | 0.5 inches |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,236) |
| Date First Available | 16 Jun. 2017 |
| Finish | Polished |
| Included Components | Pair of Plumbthumbs |
| Item Package Quantity | 1 |
| Item Weight | 80 g |
| Item model number | 2021-01FU-4-38306 |
| Manufacturer | Grakob |
| Material | Plastic |
| Number of Pieces | 1 |
| Package Dimensions | 24.7 x 9.9 x 2.3 cm; 80 g |
| Part Number | RCT3 |
| Power Source | Hand Powered |
| Size | Variety Pack |
S**.
Handy toolbox addition
A good idea that works well. No more dirty water stains when carrying radiator out the room. Or can temporarily detach pipe without having to fully drain down.👍
A**R
The tool is made from high-quality plastic and is designed to withstand wear and tear.
The 15mm & 22mm Grakob RCT3 Plastic Plumb Thumbs Radiator Capping Tool is a versatile tool that can be used for a variety of plumbing tasks, including removing and installing radiator caps, as well as capping off pipes. It is made from high-quality plastic and is designed to be durable and long-lasting. Good: Versatility: The tool can be used for a variety of plumbing tasks, making it a versatile addition to any toolkit. Durability: The tool is made from high-quality plastic and is designed to withstand wear and tear. Easy to use: The tool is easy to use and can be operated by one person. Safe: The tool is designed to be safe for use and will not damage pipes or fittings. Affordable: The 15mm & 22mm Grakob RCT3 Plastic Plumb Thumbs Radiator Capping Tool is an affordable option for plumbers of all levels of experience. Light weight: The tool is lightweight and easy to carry, making it convenient to take with you to job sites. Bad: Not as durable as some other tools: The tool may not be as durable as some other tools, such as brass tools. May not be suitable for heavy-duty use: The tool is not designed for heavy-duty use and may not be suitable for use on older or corroded pipes. May not be as effective on some types of pipes: The tool may not be as effective on some types of pipes, such as copper pipes. Some users have reported that the tool can be difficult to use on small or tight spaces: The tool may be difficult to use on small or tight spaces, such as behind radiators. Some users have reported that the tool can be difficult to use with worn-out or damaged caps: The tool may be difficult to use with worn-out or damaged caps. Overall: The 15mm & 22mm Grakob RCT3 Plastic Plumb Thumbs Radiator Capping Tool is a good option for plumbers who are looking for a versatile, affordable, and easy-to-use tool for removing and installing radiator caps. However, it may not be as durable as some other tools and may not be suitable for heavy-duty use.
W**G
Radiator tool
Good product for the job but only snapped in half but can still be useful
I**D
Radiator tools
Very useful product. Saves a great deal of mess when removing radiators
T**W
Excellent tool – makes the job so much easier
The Plumb Thumbs 15mm & 22mm Radiator Capping Tool is a brilliant bit of kit. Well made, fits perfectly, and does exactly what it’s supposed to do. It makes capping radiators quick and hassle-free, especially compared to struggling with makeshift solutions. Solid build quality, easy to use, and a real time-saver on the job. One of those tools you wonder how you managed without once you’ve used it. Highly recommended for anyone working on radiators regularly.
S**T
Wonder why I didn't get a set earlier
A very useful addition to the tool cupboard. I had help my dad remove a radiator temporarily while they got some work done on a bit of damp. These made the job so much easier than it would have been before. Close off the lockshield valve, remove the TRV and use a decorators cap to close the valve. Bleed the excess pressure (and water) out via the bleed valve at the top of the rad. One side at a time with a tub underneath to catch any drips, disconnect the valve from the rad, pull the valve away from the rad just enough to slip this in place and attach it to the rad tail, repeat for the other side. Then the whole rad (including the water inside) can be moved outside and emptied into a drain, rinsed through with water, or even stored with the water in for now, etc. So much easier than emptying it one tub at a time and then stuffing a rag in each side so it doesn't drop as you carry it through the house. Belt and braces, we put a 1/2" bsp blanking cap on both of the valves so that if the valve wasn't 100% closed the few drops of water that got through wouldn't get out onto the floor. Not really needed, but for about £2 for the blanking caps, it wasn't going to break the bank, for another layer of protection. Only downside is that you have to carry the extra weight of the water (though in reality it's not actually that much extra weight on a normal Type 21 or 22 rad. Personally I think they are a bit overpriced for two bits of plastic that are this size, but they do the job well.
N**S
Plumb Thumbs
Very clever product allowing for removal of radiators without draining them. Have only used a few times, not sure how long they will last but for a diyer they are perfect for the job.
R**S
Minimal mess and thread catches quickly
These products are a valuable addition to any tool box, especially if you don't want to drain a radiator before removal. The thread catches quickly and makes a full and effective seal against water leakage, resulting in minimal loss of contaminated water from your heating system. Word of warning - the radiator will be very heavy when lifting off the wall brackets due to retained water.
Trustpilot
2 weeks ago
2 weeks ago