Is there a steel plastic composite pipe in the PPR pipe now?
Stainless steel PPR: the outside is PPR, and the inner layer is made of stainless steel, just like the stainless steel tube inside the PPR tubeSteady tube PPR: the inner and outer layers are PPR, and the middle layer is stainless steel.
PPR composite pipe has: aluminum plastic PPR pipe: inner and outer layer is PPR, the middle layer is aluminum skin
