Penn Baso Y99AC-01 Screw Terminal Thermocouple Connector 379-1 NOS 283U. This Penn Baso Y99AC-01 Screw Terminal Thermocouple Connector is a top-quality product that is perfect for your HVAC and refrigeration needs. It is a genuine NOS item that is made in the United States, with a part number of 283U. The brand is well-known for producing reliable and durable products that meet the needs of their clients. This screw terminal thermocouple connector is designed for use in various industries, including business and industrial settings. It is ideal for connecting thermocouples to measuring devices and other equipment. With its high-quality construction and design, this Penn Baso product is sure to meet your needs and provide you with a reliable and long-lasting solution.