The shaft transmissions with gastight bulkheads and/or deck glands have developed for small and medium size tankers for the power transmission from driving engines in the engine room to cargo pumps in the pump room. A suitably designed flange with centering ring enables the mounting of the transmission on the deck or bulkhead. The shaft of the gastight bulkhead gland is equipped with two grease lubricated roller bearings(at each side one bearing) and sealed by means of special seals such as radial seal ring and single or doule mechanical seals, can be delivered on request. The transmission with gastight glands are designed according to the latest rules of the classification societies and can be delivered with type-test certificates from ABS, CCS, BV, KR, NK, KR and R. I. N. A.