CNG truck gas pipes (metal coated hose) is generally divided into three layers, the innermost layer is the inner tube of PVC rubber layer, the middle is the metal protective layer, and the outermost layer is the flame-retardant layer. The metal protective layer plays the role of holding the PVC inner tube, and the protective layer plays the role of flame retardant and preventing rat bites and scratches. The price of the two ends of the PVC gas hose is cheaper. It is suitable for home use where the liquefied gas is connected to the liquefied gas tank and requires regular ventilation. Compared with the first type of stainless steel bellows, it is more convenient to replace.
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