PLUMBING & HEATING BUNGS BY HEATLAB - Eliminate The Need To Drain A Full Central Heating System Down With These Plumbing Bungs, Tank Bung, Radiator Bung Kit - Essential Plumbing Tools And Equipment

I was pleasantly surprised by the quality of these, purchased them to isolate my F&E tank so I could replace a seized 3 port valve without having to drain my hot water cylinder down, worked a treat and held while I did the job, these will last for years and would stand up to frequent professional use

They fit. They did the job. They look like they will last. Very pleased I bought them. You only need them to work once and you will smile like a Cheshire cat.

In some ways not an issue for the product but something to be aware of - if the pipes have any burrs, the bungs will be cut up quickly and will, I'm sure, become unusable.Using pipe slices - burs are always internal, so using the external cap worked a treat and was far more secure than the internal bung option.Still I liked these and recommend them to stop the flood when a stop cock/gate valve doesn't stop the flow. I felt confident leaving them in place overnight to do their job.

I used these last summer to clean my system radiators and cold waster tank. Very useful to prevent leaks and bung pipes.

Good value and does the job

Clever idea, worked a treat on allowing me to change radiator valves to match new anthracite radiator

They work.

I purchased to help me change some rad valves without draining down. I have a central heating system with a make up tank in the loft. (It is not a pressurised type system) On my system the make up pipe from the tank happens to be in 22mm. So the inside part of the brass tank connector in the make-up tank is slightly bigger bore than the inside of a 22mm pipe itself. Many systems will be like this. The largest 22mm part of the bung is not big enough to seal a 22mm tank connector. I ended up winding some elec insulating tape around the 22mm end of the bung to make it slightly bigger. I might as well have made something up from scratch rather than pay £13 quid. I assumed that the taper of the 22mm bung would be big enough to cater for a 22mm tank connector. I thought wrong. It’s a shame because the silicone is great and better than hard rubber.