The Carrier 346322-753 7/8" Stem Cap Kit is an OEM replacement component designed to protect refrigerant service valves in compatible Carrier HVAC systems, particularly air conditioning and heat pump outdoor units. It works by securely covering the service valve stem, creating a tight seal that helps prevent refrigerant leakage, moisture intrusion, and dirt contamination. This durable... https://www.partshnc.com/346322-753-carrier-stem-cap-kit-78-inch