Blu-Lock™ is the cleanest, fastest, most reliable way to build and maintain an environmentally-friendly, professional sprinkler system. With the revolutionary push-and-go design, simply insert pipe into fitting to create a secure, leak-free connection. No Clamping, No Gluing, No Waiting. Compatible with Hydro-Rain® and Eco-Lock® push fittings and pipe. WARNING: For non-mainline cold water outdoor irrigation connections only. Do not insert fingers Fast - Installation is up to 70% faster.Easy - No clamps needed with patented "push and go" fittings.Green - Eliminates the need for harmful glue and solvents that can be hazardous