JBL Tower X Marine Speaker System life buoy these are 3/8 unc into

these are  3/8 unc into head reduced to 5/16  manifold studs while port alignment with cylinder heads is the same the clearance for a larger stud and nut makes them difficult to fit

Experience seamless operation with the key drive type

suits 1" dia prop shaft

NMMA approved

JBL Tower X Marine Speaker System life buoy these are 3/8 unc intoThe JBL Tower X Marine Speaker system is ready to take your next outdoor adventure to the next level. The fully marinised speakers deliver a JBL pro sound experience complete with RGB lighting to bring it to life. Their rigid Polypropylene long throw oofer cones deliver great bass to ensure you never miss a beat coupled with a titanium horn loaded compression tweeter and idelity for accurate reproduction. The woofer and tweeter assembly incorporates a