I have a old manual system that I am trying to update. At the valve box I have 3 manual that are shot and need replaced, no biggie I thought. Then I run into this black pipe that I cant match up or find anything to convert over to pvc. Markings on the fitting is Plastiline anybody know what or where to get parts to convert over to the new style electric valves. Local plumber in the business since the 40s has never seen the stuff. I really dont want to have to replace all the lines since they are still good. Thanks for any help.