Guy I treched and buried all the drain line off the gutters and connected them an ran out a 15ft piece of corrgulated pipe into a pop up emitter. I left it uncovered to be sure it would flow right. Which it did the water came out the cut out on the underside of the pop up emmitter. Question if I cover the pipe up ect will the emmiter pop up or not? I just had it stuck into the 4in corg. pipe with no adapter. I did put some rock under the emitter but nothing was covered up. We had a pretty good rain but the emmitter never once popped up. Is there an installation error?