In this photo you can see the machined groves in the bottom of the valve body. They are machined in to help retain a marine sealant and thus prevent leaks.


You can also see the proper placement of the Jam/Jamb nut and flange nut. I purposely placed the dog washer on backwards to show what NOT to do. The dog should always face the valve body and with valve open be oriented at 12:00.