🔒 Premium 10-pack Aluminum Oil Drain Plug Gaskets 12mm I.D. 20mm O.D. by A Plus Parts House - Enhanced Leak-Proof Performance! Review

I don't know why I was asked to comment on their transparency but they are round with a donut hole, mash well and seal completely.

They hold the seal very well. They are on my VTX1800c. They look different than the stock ones, but that's because the stock OEM washers are crimped.

The problem is they do NOT have an internal diameter of 12mm. They have an inner diameter of more than 13 mm. I don't trust them to seal properly.

Everything is as written in the product description. They fit a 12mm drain plug with a 20mm sealing flange and are 2mm thick just like the OEM drain plug gasket. I will be buying a few more of these to have on hand.

The product is almost the same as the retailer. Almost impossible to tell apart. which came on my bike from the factory versus the originals from the dealer versus these note: 3 with black lines I've marked so you can see exactly what you're getting from the dealer. The larger ones are the ones that were installed on the bike at the factory.