Fits GM LT Gen-V engines (2014 & up), M12 x 1.75 w/ Tapered Seat to 1/8" NPT Female Port - Stainless Steel. Adapter NPT Size ( A )1/8 NPT FEMALE. These Special Plugs and adapters are needed when you remove the vacuum pump on the GM LT Gen-V - 2014 & up engines.
