INDUSTRIAL SPARE 3T374 NSMP 4” Refrigeration Part Brass NOS 283S. Not sure what application this part goes too can not find it on the internet anywhere. So if you know what it fits and you need one here you go. This industrial spare 3T374 NSMP 4" refrigeration part brass NOS 283S is a high-quality replacement for your refrigeration system. Made by Carrier, a trusted brand in the industry, this brass part is durable and reliable. With a country/region of manufacture of the United States, you can be assured of the quality of this part. It is perfect for use in other HVAC refrigeration systems and is a must-have for any business or industrial setting. Don't miss out on this opportunity to upgrade your refrigeration system with this top-of-the-line brass part.