don't think they come with filter bypass - my last two campers did not.
and i don't think that the sanitization would hurt the filter, after all it should be able to withstand chlorine from a municipal fresh water system and a sanitization cycle is a smidge more chlorine than what would be seen there.
If you don't want to expose the filter to the bleach/chlorine simply take the filter out and put the empty canister back in and then proceed to sanitize. You can then put the filter back in (or put in a new one) after you are done.
The valve i do have is on the pump that switches the fluid source for the pump from the fresh water tank to the winterizing port.
HTT: "EscapeII" 2016 Shamrock 23WS (current)
PUP: "Escape" 2010 Rockwood HW 277 (gone)
TV: "Bruce" 2011 Dodge Durango V8 Hemi Crew
Just us gals (me, Sis and our daughters)
We spend alot of money to go sit in the woods