This is a new, unused Plastic Extruder inlet fitting for a all Gen 1 Markforged Desktop Series and Industrial Series 3D Printers.This fitting is compatible with the A1095 Plastic Extruder.This fitting is NOT compatible with the A3648 Plastic Extruder.Markforged refuses to sell this as a replacement part. being made of brass this wears out easily from Onyx's aggressive surface roughness. Dont waste money on a new extruder, buy this fitting instead!