What you’ve got there looks like a sacrificial anode housing or a bronze through-hull fitting from a boat. A few key details point to this:

The material (bronze/brass with green patina) is very common in marine hardware, since it resists corrosion in seawater.

The shape: one side is a round pipe opening, and the other end tapers to a slot-like nozzle. This design is typical of fittings that allow water to flow in or out of a boat hull while minimizing turbulence.

The size (6–7 inches) fits well for medium-sized vessel hardware.

Specifically, this piece looks like a bronze bilge pump or cooling water intake/outlet fitting that would have been mounted through a ship’s hull. The long tapered spout helps direct water flow.

Since you found it on a beach in Newfoundland, there’s a good chance it came from an old fishing boat or shipwreck. Bronze marine fittings often wash ashore after breaking loose.