The present disclosure relates to a high voltage adapter (1) for insertion into an adapter socket (2) in a high voltage unit (10), the adapter (1) comprises an oblong cylindrical main body (3) having a first outer diameter (D1), the main body (3) comprising a first circumferential portion (3′), the first circumferential portion (3′) having a second outer diameter (D2), wherein the second outer diameter (D2) is greater than the first outer diameter (D1). Further, the adapter (1) comprises a first threaded female portion (4) extending from a first base (5) of the main body (3) and a second threaded female portion (6) extending from an opposing second base (7) of the main body (3), each threaded female portion (4, 6) extending perpendicular to each corresponding base (5, 7) into the main body (3). Moreover, each threaded female portion (4, 6) is arranged to receive a threaded male connector (17, 18), so to transfer voltage signals from a first environment to a second environment. Also, the female portions (4, 6) extend towards each other and are separated by an inner wall (9).