This is our class 4 gas lift ,it has passed TUV,SGS,LGA test.It mainly exported to europe courtries.For example,USA,ITALY... This is our class 4 gas lift,it has passed TUV,SGS,LGA test.It mainly exported to euope courtries,For example .USA,ITALY,GERMANY,and so on.....The thickness of the 28mm pipe:2.5mmThe thickness of the 50mm pipe:2.0mm Gas lift