CVP-ADAPT-M2M Noritz Male to Male Vent Adapter Noritz have changed the flue of all NEW DVC models to prevent condensate leakage where long vent runs are applied. With this change on the DVC model’s flue, the vent direction will be opposite from before. All existing DVC adjustable, straight and elbows will remain the same Only DVC termination vent pieces will change. Note:Old Heaters with Old Venting: No changes or additions are necessary. These items will work together as alwaysNew Heaters with New Venting: No changes or additions are necessary. These items will work togetherNew Heaters with Old Venting: This installation will need this adapterOld Heaters with New Venting: This installation will need a Female-to-Female adapter piece, part number CVP-ADAPT-F2F