Geo-Flo manufactures a variety of geothermal hose kits that use 1″ reinforced rubber hose along with a selection fittings to provide a flexible connection from a flow center or ground loop to any geothermal heat pump. Each heat pump manufacturer has their own preferred water in/water out connections on their heat pumps, typically 3/4″ or 1″ FPT, 1″ female swivel union, or double O-ring (Flo-Link) female.