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This fits to the original effector and can be tapped to M6 for both bowden tube fitting and stainless steel hollow threaded rod that the heater block attaches to. Atach a gasket or silicone over the exposed cavity and secure a washer large enough to seal the underside cavity. Run a small aquarium water pump and pipe the flow through the core of this device to keep the filament hard in the top half inside the SS threaded rod, this stops jams. Choose the gold plated model for low corrosion.