Does not included an orifice. See related items to purchase separately. 

WARNING !! - Burners must be installed and plumbed by a qualified plumber.  NEVER install a natural gas burner without the help of a qualified plumber and ALWAYS consult local building codes prior to installation.  Improper installation could result in injury, loss of property and/or death.  NEVER leave any burner lit while unattended!! Never light this or any burner in a closed or confined space as they can and will emit carbon monoxide which is DEADLY.  This burner is for outdoor use only and should NEVER be used inside any structure.