Manufacturer: Niikura Kogyo  Co., Ltd
Model: MDP-32

Function

You use it as a plug to seal the drainage hole securely.

Features

We using the swelling of packing then block up all the purpose of drainage holes.
If you want to remove nut,use spanner for revolve by turn in a different direction, the outer diameter of packing will change to first original status before then you can remove it.