1-1/4-12 Threaded Bung With Jam Nut - LH Thread Universal Fit;Features 2-1/2 of 1-1/4-12 Lh Threads;Fits inside a 1-1/2 I.D. Tube Minimum;Includes Custom Jam Nut;Cnc Machined Steel Construction;Must Be Welded with Jam Nut Included Currie Currie 1-1/4 Inch -12 Threaded Bung With Jam Nut - LH Thread - CE-9114BL CE-9114BL Tube Adapters