Water hydrant adapters, valves and couplings were stolen from the 300 block of Edgehill Drive in Spring Garden Township.
The theft happened between noon Sunday and 7 a.m. Monday, according to township police.
Work was being done in the area to clean and line water main lines. The items are valued at several hundred dollars, police said.
Anyone with information is asked to contact Officer Adam Zimmerman at 843-0851 or through sgtpd.org.