Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread

Used it to swap out the springs in a VW engine. Per the instructions on the box, 30-50 psi working pressure. Set the hose pressure to 30 psi and carefully opened the valve. Worked like a charm! Kept the valve closed while I swapped the springs. Glad I have this tool. Not sure how many times I will be able to use it but I'll post an update if needed.

Works great

Must have if you are fixing broke valve springs

This thing worked great. The only thing keeping it from a 5 star product is the fact I had to use an adapter for my particular application. Would've been nice if that was included. Luckily the adapters from a pressure gauge work well. All in all, it did the job.

The description says it works with an M14 thread size, however the tool does not thread in properly. I’m not sure if I just got a faulty one but I’m not very happy with the quality of this tool.

Pros: Ball Valve (on/off) lever, two size spark plug threads. Cons: Had different male attachment for my air compressor. It would be nice if it wasnt shipped with it on because it is hard unless you have a vice to remove and change it out. Overall: It is useful and I plan on utilizing it to run a small motor from compressed air. Thank you

Cheap and bad tool disposable type

This product works great for allowing air to enter the cylinder to keep your valves from dropping in. Would definitely recommend to anyone else.

Work as expected...

Crack bit of kit

Was perfect for the job, kept pressure in the cylinder perfect

haven't used it yet but looks like a good replacement for my old one

This product is dangerous and unfit for its purpose. My compressor was only running at 60psi, and before it was even at full pressure the hose started bulging. To add insult you cannot get a refund for this faulty product.