Where can I get pneumatic valve recovery in Tianjin?

Beichen District inventory second-hand valve recycling, the specific location is opposite to Tianjin Beichen District Commercial School. Please confirm the product model, whether it is in place, property rights and so on. Before seeing the goods. If the price is lower than the market price, please be careful not to be cheated. Please take photos and carefully check the invoice, quality guarantee, ID card, business license and other information.