This is a petcock gasket rebuild kit for some vintage Suzuki motorcycles. This is a seal replacement kit for your OEM petcock. 

This is the OEM part! Don't be fooled by copycat sellers peddling aftermarket junk. It's a waste of your time and money as your petcock will be leaking in no time.

It will include:
Mounting/Joint Nut Viton o-ring
Internal bowl Viton o-ring
Packing(4 hole) gasket

This kit is for the gaskets only. Petcock parts are shown for reference purposes and not included.  Please check the application list for your model and year before buying.  You may need to view this listing on a computer browser rather than your phone if you cannot see the list. 

Mounting gasket goes inside the joint/nut and between the petcock base and the tank. 

Bowl gasket goes inside the petcock and compressed by the bowl. The key to a successful installation on this gasket is not to over tighten. No more than 1/2 turn after firm contact is all you need.

Packing gasket goes behind the lever.
All gaskets should be lubricated before installation.