Jandy JLPBBL Pebble Lid and Collar For Laminar Jet Water Designs create spectacular backyard water entertainment with dazzling nighttime lighting effects. They produce clear or lighted arcs of water of water as they silently enter your pool or spa. Laminar Jets are easily adjusted at the deck to create arcs of water up to 7 feet high and can project 8 feet into the pool. Flow can be adjusted with an innovated internal flow adjustment valve conveniently located inside the canister for easy adjustment and tuning.