It is a Silver Tone internal Hex Head Pipe Connector that is for closing and terminating the end of a pipe. Its thread diameter is1/4 PT, made of metal material. Great for blocking off intake manifold water ports, water pump ports, water temp and oil sender holes, engine block holes, etc. .
Product Name : Hex Head Pipe Plug;Color : Silver Tone
Material : Metal;Thread Diameter : 13mm/ 1/4" PT
Height : 8.7mm/ 0.34";Hex Side to Side Diatance : 6.2mm/ 0.24"
Net Weight : 10g
Package Content : 5 Pcs x Hex Head Pipe Plug