The type B hose adapter is designed for connecting 38 mm pool hoses to plunger valves and other pool equipments. The hose adapter converts pools with 32 mm fittings to 38 mm fittings. These hose adapters will be needed when upgrading from a low-flow pump system (3785 l/h or smaller) to a larger pump system (5678 l/h or larger). This product ships in approximately 1 days