The Davies Craig Heater Return Adaptor can be used directly with the EWP115 & EWP150 Alloy Pumps and with the EWP80 & EWP130 when combined with our 38mm Straight Adaptor Alloy (Part 8304) It offers greater flexibility and assists with the connection of a heater return hose when fitting one of our Header Adaptor Kits for a EWP conversion.