Lost your drain plug (bung plug)? We keep stock of these plugs for just such an emergency! This is just the plug (not the base plate).

Get back on the water fast!

Fits most sit-on-tops and has an O-Ring for a better seal.
Size: 25mm across top of bung, 15mm across the part that fits in the hole.

The thread is slightly more narrowly spaced than the Ronstan bung.