Versatile proportional solenoid valve compatible with Caterpillar E320B, E320C, and E320D excavators. Part number 111-9916 (KWE5K-31/40E30-137) with Yellow Dot marking operates at 24V. This valve delivers precision hydraulic flow control across travel, implement, and auxiliary circuits, making it ideal for restoring proportional control performance on any E320 series excavator model with a single part.