This product consists of a 1 1/4 inch close nipple with 1/2 inch NPT male threads on one end and 1/2 inch NPT female on the coupling. The total length of the bulkhead is 2 1/2 inches. This fitting is for use with products with a wall thickness between 3/8 inch (min) and 9/16 inch (max) such as cooler style mash tuns.