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GW, 3/4 NPT allen pipe plug. Chrome

NPT threads are 'self sealing' since they are slightly tapered, the diameter slowly becomes bigger towards to top. - 26.2mm is the approx. diameter of this plug in the middle of the plug, including the threads itself. Note: For easier identification of the correct plug, the diameter (approximately measured in the middle of the plug, including the thread itself) is given in millimeters. Note: Pipe plug sizes are totally different when compared to common US bolt sizes.