This standard specifies the types and dimensions of drain, fill and level plugs and hand tool fittings for earth-moving machinery. This standard applies to drain, fill and level plugs for lubricating oil, coolant, hydraulic oil and fuel oil.
GB/T 14780-1993 history
2010GB/T 14780-2010 Earth-moving machinery.Drain,fill and level plugs
1993GB/T 14780-1993 Earth-moving machinery. Drain, fill and level plugs