Originally Posted by SoCalLandscapeMgmt
Are you effin kidding me? Did you really just suggest spraying WD-40 on a spray head riser?
Any petroleum based product, WD-40 included will damage PVC. I'm sure that it will not do very well for the riser seal either. Clean the stem and the riser seal with water and make sure there is no sand in there. If either the seal or the stem are scored then replace them and make sure that the head is set to the proper grade.
Geez Don, I had not realized you were a petroleum engineer, as well as all the other gigs you profess to be a expert at. You've got your head up your butt, as usual.