Coolant connecting piece, housing system and production thereof

A coolant connecting piece (100) for conducting coolant between a first housing (201, 503) and a second housing (203, 507), wherein the coolant connecting piece (100) comprises:

• a cylindrical main body (101) with a coolant channel formed on an inner side of the main body (101),
• a protective ring (103) with a drip edge (117),
• wherein a cross-section of the protective ring (103) is greater than a cross-section of the main body (101),
• wherein the drip edge (117) is configured to let condensate running off on an outer side of the main body (101), opposite the inner side, drip off into a predetermined region (213),
• wherein the protective ring (103) is arranged centrally on the main body (101), and the protective ring (103) is configured as a separate element or in one piece with the main body (101), and
• wherein the protective ring (103) has a radially circumferential groove (115) which is sloped toward the drip edge (117) at least in regions.