The Olympus MH‑438 Air​/​Water Valve is an air and water valve used in Olympus endoscopy systems, especially compatible with EVIS 140 and similar series. � It controls the flow of air and water that helps clear the lens and operate the endoscope during procedures. � This part is installed in the control section of the endoscope to regulate delivery precisely and reliably. � The valve ensures consistent performance in colonoscopy, gastroscopy, and other diagnostic endoscopic examinations. � It is an OEM Olympus part often required as a replacement in maintenance and service work Return Policy: Items are sold as-is with no returns or refunds available unless explicitly stated.