Deeper bury is available by special order from the distributor or by customer providing longer ductile pipe and longer stem rod.
通过向经销商特别定制或由用户自行提供更长的球墨铸铁管和更长的阀杆，可以实现更深的掩埋。
Deeper bury is available by special order from the distributor or by customer providing longer ductile pipe and longer stem rod.
通过向经销商特别定制或由用户自行提供更长的球墨铸铁管和更长的阀杆，可以实现更深的掩埋。
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