2.5-inch and 4-inch/without inner wire, flange connection 2-inch and 3-inch/two connection methods: threaded connection and flange connection. Introduction: (2-inch/DN50: Different manufacturers have different standards, such as ZTQ-50/2SZT-50, etc., and the usage and installation dimensions are all standardized.) It is widely used as a flame retardant and breathable cap for oil tanks and a necessary supporting equipment for small gas station oil tank ventilation.
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