The Outdoor Plus OPT-QD42EKIT-ASH-LP 42" Ash Liquid Propane IID Quad Concrete Fire Pit. The Quad Concrete Fire Pit is made from a memory, a memory made of simplicity and style. Its square shape and low to the ground height makes the Quad a beautiful center piece in your outdoor space. Our Fire Pits are individually handmade and proudly manufactured in the U.S.A. The fire pits we manufacture are durable and long-lasting in a variety of environments. Because of its handmade nature slight variations in color and texture may occur.