"I bought this and set it all up, only to find that the pressure does not remain constant. I also set it up on a short length of pipe with the same result! I wish I had read the previous review before I purchased it, i too wonder if Building Control would accept the test on this basis!"
"I should have read the following reviews first but bought from the catalogue. I set the kit up on a bench with a 2m length of new soil pipe, pressurised to 100mm and watched the level fall! If the tube from the rubber bulb was clamped, it held the pressure. Conclusion: The valve in the rubber bulb leaks which is not surprising at such low pressure and a clamp should be included to isolate the bulb at this price for a kit of rubber tubing. Returned it to Screwfix who apologised and refunded me with no problem. Good service from the Norwich South branch."