Here are two slightly larger than model sized whistles. The larger is a Lunkenheimer No. 2 I purchased at a flea market. I picked up the smaller one at an engine and tractor show. I cleaned them up, plumbed for air, and mounted on wood bases. To block air from exiting the bottom of the tees into the mounting flanges, I internally tapped each tee and installed a pipe plug.
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https://youtube.com/shorts/JPM2O2DQZ_AHappy Steaming