This left tension pulley is a precision-engineered replacement component designed specifically for Murray MT100 and MT200 42-inch deck mowers. Identified by part number 2103900023A, this deck idler pulley plays a crucial role in maintaining proper belt tension and ensuring smooth operation of your mower's cutting system. The pulley features a durable metal construction with a protective finish and an integrated bearing for reliable rotation. Its robust design helps maintain consistent tension throughout the deck idler pulley system, contributing to efficient mower performance and extended belt life. Built to meet exact specifications, this component ensures a secure and accurate fit for your equipment. Installation is straightforward, making it suitable for both professional repair technicians and DIY enthusiasts looking to perform their own maintenance. Before purchasing, we recommend reviewing the product images and verifying the listed measurements to confirm compatibility with your specific mower model. This replacement part helps restore your mower's performance and keeps your lawn care equipment running smoothly.