The Sight Glass & Drain Assembly was designed for use in the DR1000 DWC System, but will function just as well in any similar system with a 1-1/8" mounting hole for the high quality bulkhead connector with ribbed gasket seal. When installed correctly the assembly provides an effective monitoring range of between 2-1/2" - 9" of liquid. The drain valve barb accepts standard 1/2" tubing, and there is a bulkhead screen to help prevent roots from clogging the opening while performing a nutrient change. The assembly can be disassembled for cleaning and can be reconfigured using simple hand tools and thread tape. Includes simple installation instructions. Assembly tools not included.