Orbit 38098 3/4-Inch by 3-Inch PVC Risers Raise sprinkler heads to the level you need Molded gray schedule 80 pvc construction Not for use under continuous pressure For outdoor use with cold water only Easy to use Molded gray Schedule 80 PVC construction Tapered inside ends allow standard pop-up head to slide up and down without restriction 3/4-Inch by 3-Inch