This is a complete replacement for old Thetford waste dump valves.   It has a 2" long 3-1/2" I.D. slip fitting on top for mounting to a pipe.  It has a 1-3/8" long 3-1/2"O.D. slip fitting on the bottom outlet side.  Blade is plastic.  Comes with handle.

This is version 08669 of Thetford valve 01447. Every Thetford valve ever made says 01447 on it, so you can't rely on the number molded into the plastic to guide you in selecting the correct version.