N Scale PRR P70 Roof Hatch 4PK

Image by Keystone Details

This N Scale PRR P70 roof hatch sprue is specifically desinged for the Keystone Details arch and clerestory roofs (may fit other roofs as well).  

Vents of this type can be seen in photos in the book "Passenger Equipment of the Pennsylvania Railroad Volume 1: Coaches" by Liljestrand and Sweetland published by The Railroad Press 2001.  View these and online photos for placement.