Edelbrock Fittings Pipe Plug Kit Internal Allen Head 1/8In 1/4In 3/8In 1/2In NPT Set of 8Edelbrock part #8052 Steel has a variety of pipe plugs to fill your application. Be it your nitrous system or intake manifold, we offer many different sizes, quantities, and finishes to close the unused holes. Kit contains (2) 1 8 in. NPT, (2) 1 4 in. NPT, (2) 3 8 in. NPT and (2) 1 2 in. NPT plug fittings. Sold as a set of 8. Socket Head Pipe Plug