48 x 2.0 Metric Hollow Hex PlugThe 48 x 2. 0 Metric Hollow Hex Plug is a large diameter metric male plug with a hollow center and an internal hex (Allen) drive for easy tightening and removal using a hex key. It is used for sealing, venting, or draining fluid or gas in hydraulic, pneumatic, automotive, and industrial applications. Specification Details TYPE Hollow Hex Male Plug DESIGN Hollow Hex (internal hex drive) allows for easy tightening and removal using an Allen key.