1 in. IPS x 500 ft. DR 11 Underground Yellow Polyethylene Gas PipeIPS size (iron pipe size) Medium density polyethylene (MDPE) construction Approved for direct burial in accordance with your local plumbing building codes Only for underground use For use with HOME FLEX underground fittings 90% lighter than using steel pipe Durable polyethylene will last for years and years For more information visit homeflexUnderground. com Features Item Weight 40 Connectivity Compression Material Polyethylene Color Family Yellow