The Rain Bird® WC20 is a WPSK20 Wire Connector Splice Kit, Kit 20. When your installation crew is making countless wire connections on a job site, why slow them down with unnecessary work steps? Using Rain Bird’s WC20 Series Wire Connectors, they get the job done faster. Unlike other wire connectors on the market, Rain Bird's WC20 wire connectors are quick to install and provide reliable moisture sealing for controller and valve electrical connections you can count on