What is the correct fill procedure for a PEX tubing system?

Filling a PEX tubing system properly is essential for ensuring that the system is free of air pockets and is pressurized correctly without causing stress on the tubing. The correct procedure, which involves filling at the low point slowly, allows for better control of the process. By starting at the lowest point, you ensure that air can escape as the water fills the system, preventing air locks and ensuring efficient water flow throughout the entire system.

Filling slowly is crucial because it allows any trapped air to vent out of high points as the water rises, facilitating a more complete fill without overwhelming the system. This method helps in minimizing the risk of surge pressure which can damage the tubing or fittings.

In contrast, other methods such as filling quickly at the highest point could introduce air into the system, while filling at multiple points simultaneously might complicate the process and increase the chance of air remaining trapped. Using reverse pressure is not a standard practice and could lead to significant issues with the integrity of the piping.