In 1916, Egnell bought the company and the name changed to AB Pentaverken. Production was concentrated on engines, mostly for maritime applications. The years immediately after World War I were economically harsh, but a new product was introduced: a small two cylinder U2 outboard engine designed by Carl-Axel Skärlund. The U2 was slightly improved in 1926, and renamed U21 and remained in production until 1962. The U2/U21 was a great success and exported worldwide. In many countries, U21 is still synonymous with outboard engine.