Several sprinkler heads have migrated up and are repeatedly getting clipped by the mower. Bought 4 inch heads but the male attachment in the ground is too big. Bought adapter but can't get the old one off. It is at a terminus, not a "T" so it is and "L" shaped attachment. It should just screw off no? Afraid of damaging pipe holding it with pliers. Do they use some sort of cement when installing so that I would half to cut the end off? Thanks.
