Diy Train Horn - Diy 12v 3 5a Trumpet Train Horn Air Compressor Pressure Switch Rated 170 200 Psi Popular Psi Switch Psi Pressure Switchpsi Air Compressor Aliexpress - The horns are made with three reducers, the diaphragms are cut from a tupperware storage container that's about an eighth inch thick.

Diy Train Horn - Diy 12v 3 5a Trumpet Train Horn Air Compressor Pressure S…