The Outdoor Plus 22 Castillo Pillar GFRC Concrete Round Natural Gas Fire Pit Without Access DoorThe 22-inch Castillo Pillar GFRC Concrete Round Fire Pit is the perfect addition to finish your outdoor project with. It has 10-inch 304 stainless steel burner that produces 45K BTUs of heat and glimmering flames. This fire pit comes with lava rock burning display but you can upgrade to fire glass (sold separately). If substituting for fire glass, 25 pounds is usually recommended. The burner is compatible with both natural gas and liquid propane.Pro