SeaDog 432620 Maxblast 20 Amp 125 DB 12V 11 PSI Dual 9-5/8" Trumpet Air Horn | Chrome Plated Brass SMARTSTICK Mounting stems are 1-7/32 inches

Mounting stems are 1-7/32 inches long and feature a 13/16 inch – 20 thread diameter

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SeaDog 432620 Maxblast 20 Amp 125 DB 12V 11 PSI Dual 9-5/8" Trumpet Air Horn | Chrome Plated Brass SMARTSTICK Mounting stems are 1-7/32 inchesMaxBlast Mini Dual Trumpet Air Horn is constructed of durable chrome plated brass. When installed, the trumpet should point slightly downward to permit water drainage. Display pack includes horn, compressor, air tubing, and mounting hardware. At 125 decibels and a frequency (Hz) of 63015A 52515A, this horn meets the US Coast Guard's COLREGS, US Inland Navigation Rules, Annex III Regulations, and ABYC standard A 23 for boats up to 20 meters (66).