Daqing is specialized in R&D, production and sales of car engine cleaning machine since 1998. Our products are distributed to UK,USA, Germany, India, France, Australia, Denmark, Intelligence, Africa, etc. Daqing owned 10 core technologies, 18 design & invention patents,Including high-efficiencyheat dissipation oxy-hydrogen generator, annular high-efficiency heat oxy-hydrogen generator, a new type of water sealed ...