Anti-freeze pipe cover, PU foaming material, which is used to protect the water inlet/outlet pipe from freezen, can take very lower temperature, we have double pipes and single pipe.

Electric belt: which normally warped with water inlet/outlet pipes, whenever the outside temperature is too lower, the pipe may be freeze and damaged, you can open the electric belt for sometime, warm the water inlet/outlet pipe.

We often warp the electric belts with the water inlet/outlet pipes and covered by PU foaming anti-freeze pipes.