Mark Ligon

Random mixture of copper pipe and brass fittings.

Check valves explained: Understanding different types and applications in backflow prevention

Learn about check valve types (swing, ball, diaphragm, dual-plate) and their crucial role in backflow prevention.

August 20, 2025

Check valves are found in and around a pump system, a sump pit, or cracked open a main line. They’re everywhere. And there’s a reason they’re there: to prevent backflow. Backflow isn’t just unpleasant—it’s a serious hazard. It occurs when water or other liquids flow in the opposite direction, contaminating clean systems.

Best practices for venting tankless water heaters

Installing vents correctly is essential for the efficient and safe functioning of tankless water heaters.

Mark Ligon

October 18, 2023

Here's what you need to know about venting for tankless water heaters and how you can approach it for the least cost and best results.

Guest Editorial: When to use PVC duct for your project

The benefits and limitations of PVC ductwork.

Mark Ligon

August 6, 2021

PVC, or polyvinyl chloride, is a durable material used in a variety of construction projects. It’s lightweight and easy to transport, making it the preferred material for many contractors. PVC duct, however, does have some limitations and cannot be used in certain applications. Read on to learn more about the uses of PVC duct.