This nipple threads into your engine block or remote filter head to accept a spin-on filter. Measures 1 inch long overall. A small knurled section located 3/8 inch from one end helps to hold the nipple in place, preventing it unthreading when the filter is removed. Fits 3/4-16 female threads in an engine block or filter head. It is not designed to allow your engine to take a different type of filter.
Note: This nipple has male threads along the entire length to thread into a filter mount. It is not the same as the male-female threaded nipple used with oil filter sandwich plates.