APK-11 Gas Valve System 

This valve allows you to control a gas log set with a remote or wall 
switch, turning it on or off. There is a standing pilot, the valve sits
inside the fireplace, and the remote sits outside the fireplace.
Remote is battery operated.

APK-15 Gas Valve System

This valve allows you to control a gas log set with a remote or wall
switch, turning it on or off as well as adjusting flame height. There
is a standing pilot, the valve sits inside the fireplace, and the
 remote sits outside the fireplace.
Remote is battery operated.

SPK-26 Gas Valve System

his valve allows you to control a gas log set with the knob on the
front, turning it on or off as well as adjusting flame height. There is a
 standing pilot, the valve sits inside the fireplace. There is no remote
option on this valve.

Remotes, Wall Switches, and Crackler

A valve system is not required to operate a gas log (or other effect),
but many people prefer the convenience that they offer.