Radiator screw coupling, angled 3/8” unfinished brass

Radiator screw coupling, angled 1/2” unfinished brass

Radiator screw coupling, angled 3/8” nickel-plated brass

Radiator screw coupling, angled 1/2” nickel-plated brass

Radiator screw coupling, angled 3/4” nickel-plated brass