The following five stories are the most-viewed stories on www.pmmag.com for the month of April.

1. The leak-detection revolution

With homes in the U.S. continuing to age, and with the Internet of Things continuing to infiltrate the home services and products market, it is not surprising that leak detection has exploded in popularity this past year. Read more>>

2. Installing check valves in a recirculation system

The conversation regarding check valves all centered around hot water recirculation systems, so let me limit this review to those systems. Read more>>

3. Why is the relief valve leaking?

Some boiler rooms have a bucket under the relief valve discharge pipe to mask the problem. The following are some suggestions if you would like to resolve the problem. Read more>> 

4. The Glitch & The Fix: March 2018

Can you spot at least six details that are incorrect in this drawing? Beyond the incorrect details, are there ways to improve the design to provide the same functionality with fewer components? Read more>> 

5. What plumbers should know before joining a franchise

Knowing when and how to become a franchisee isn’t easy, but these resources can help. Read more>>