00:51 How to judge the production strength of a factory?
00:45 Hi guys, we are a factory from Shanghai. Welcome to visit our products! #valve #LPG #regulator
02:27 00:12 Morning Guys, come and take a look at our product that shines like gold - fire gas cylinder valves#gas valve #fire valve #valve
00:56 Guys, come and take a look at our factory#valve #Pressure Regulators #regulator
00:56 How to check valves?