Everpure QL3B Filter Head with 3/8 Inch Push Fittings and Shut Off Use the Everpure QL filter head and you can select thr right filtration solution for your equipment or site, without having to keep changing the head. The Everpure QL filter head will accept a range of filtration and water treatment cartridges to ensure optimum filtration performance providing consistent drink quality and enhanced equipment protection from scale build-up. The Everpure QL3B Filter Head with 3/8 Inch Push Fittings and Shut Off has simple 3/8″ BSP Push Fittings and includes a shut off valve for easy filter changes and bracket for wall mounting.