For checking the protection against water to prove the degrees of protection with the second number X1. "Protection against vertical dripping of water" and X2. "Protection against dripping water at 15° tilt." These are the highest quality, precision-machined Drip Boxes available anywhere in the world! This is the complete system with hermetically tight drip box, specimen grate, flow control valve, shut off valve, hosing, connectors, and replacement drip valves. Various models available offering different sizes and either wall or ceiling mount options.