This can be a good and useful tool. It had a simple problem: the relief valve blew at 50 pounds of air pressure. They need more than Β£100 to be useful. Sent in for replacement, pumped air in and same problem, valve opens at 50lbs. E-mail the seller asking them to find a suitable valve. If the seller can do this I will be happy to change this rating to a positive one. If not, will be returned for a refund. Quickly