The 38mm (1.5”) hose tail adaptor is compatible with the range of Aquaforce pumps*. This is ideal if you want to upgrade your filtration pump to an Aquaforce but do not want to replace your existing 38mm pond hose that is installed with your filtration system. * Note: Aquaforce pumps come supplied as standard with a hose tail adaptor that is suitable for 25mm (1”), 32mm (1.25”) & 40mm (1.6”) pond hose.