The Kubota W21TSBU167 is a genuine OEM spark plug designed for optimal performance in various Kubota engines. This high-quality spark plug features an M14x1.25 thread, a 19mm thread length, and requires a 20.8mm wrench for installation. It is an essential component for maintaining efficient engine ignition and smooth operation in compatible Kubota RTV utility vehicles and ZD, ZG, and ZP series mowers.