Key Features: Genuine E3D Parts Replacement for Kraken HeatSink Plugs 1/8" BSPT Thread These are the plugs used in the Kraken Heat Sink and have a 1/8" BSPT (British Standard Pipe Taper) Thread and use a 5mm Hex Key. They have a wide range of applications in sealing and require a tapered hole. Replacing these plugs on the Kraken should only be completed if you are confident in your ability to achieve an adequate seal. We recommend a threadlock and a measured torque setting. Item Specifics 1 - Kraken Plug