My RB 1804's are seeping on my lowest level zone. It is also my longest run of lateral pipe, approx 100 feet. After the valve closes, all of the water in the pipe continues to seep out creating puddles around the spray heads. Should I replace the 1804's with 1804 SAM's, the one with a check valve? Or is there a aftermarket check valve that I can install below the heads?
