Senninger MR500NPT20B #20 Green Upright Mister™ .5" M NPT. The Mister™ is designed for low volume misting applications, including propagation. Its built-in check valve prevents draining immediately after each irrigation session. It also provides consistent system start-up delivering an instantaneous, highly uniform distribution that makes the Mister™ sprinkler ideal for short-cycle applications in misting systems.