1. Identify trademarks, custodians and accessories. The English trademark of imported Pilsa is Pilsa, and the pipe body is marked with the English full name, production date, specifications, origin and other information of the product. On the water pipe, PIL is black, SA is white on black background, and SA on the quality assurance card is white on blue background.

2, look at the details, take care of the body color. The color of imported products is soft white, the red line on the hot water pipe is neutral, and the width is about 2mm, while the color of counterfeit products is dark or bright.

3. Look at the wall thickness. The imported 6-minute hot water pipe has an outer diameter of 250mm and a wall thickness of 4 or 2mm, while the wall thickness of ordinary counterfeit products is only about 3 or 5 mm. ..

4. Look at the cross section. The wall thickness of Pirsa pipes produced by regular channels is relatively uniform, while the wall thickness of counterfeit products is irregular.