Gerber Genuine GA519254N Flow Controller 1.5GPM. The Gerber GA519254N Insert is a genuine replacement component designed for faucets. It serves as a flow controller with a flow rate of 1.5 gallons per minute (GPM). This insert ensures proper water flow and helps maintain the functionality of your Gerber faucet. Whether you’re replacing an existing insert or installing a new one, the Gerber GA519254N is a reliable choice