Valve ID?

[Will_Brule]

Obviously a drain valve, but from what? Inside the street-side forward storage compartment, next to the water heater, on the 25 FCC 25 FB. Don't know why the photo rotated to the left. Maybe it's the IPad.

[Jammer]

Are you sure it's a drain? My first guess would be a shutoff for the outside faucet.

[Will_Brule]

Definitely a drain. The line turns down through the floor just to the right of the valve, ending as an open pipe about 2" down.

[switz]

Image size you upload impacts orientation in a random manner. The larger the image, the more likely it will be on it's side or upside down.

I have found that a 3" x 5" image under 200k posts correctly and that is big enough for most folks to see what the object is.