DIN 906 hexagon socket pipe plug, conical thread, NPT 1/4", Article number 906A414NPT. Made in stainless steel a4. Hexagon Socket Pipe Plug, Conical Thread manufactured to DIN 906 with ANSI/ASME B1.20.1 (NPT) thread, coarse pitch. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution. Applications: sealing of threaded ports in gearboxes, hydraulic and pneumatic equipment, engines and plant pipework.