Travis Industries DVS Insert EF II Owner's Manual page 13

This heater is designed either for natural gas or for propane (but not for both). Check the sticker on the top of the
gas control valve to make sure the correct fuel is used (see illustration on page 4).
Fireplace Opening
The gas inlet
accepts a 1/2" MPT.
2-3/4"
Shutoff Valve (secured to
the fireplace insert)