This SPRINKLER GAUGE VALVE KIT is perfect for sprinkler systems without 3-way valves or ones that need replacing. The SGVK comes with (3) 1/4" nipples (2 1/2", 4", and 6" long), (1) 1/2" x 1/4" reducing bushing, (1) brass 3-way valve, and (1) 1/4" plug, while the TWGV25 allows gauge replacement without shutting off the water.