The Watts BD1156 boiler fill valve provides a faster, easier and safer way to fill hydronic heating systems — from 8 to 21 psi. Watts notes combining new features with its well-known dedication to quality allows the valve to provide great value to installers and end-users alike. The BD1156 utilizes a push-button fast fill with a high flow rate, fast-fill window indicator to easily see if the fast fill is engaged, and a 25-psi autostop to avoid over-pressurizing the system and discharging the relief valve. It also includes an easy-to-adjust dial to set the outlet pressure without the need for a downstream pressure gauge.