Allen M. Nail has been named vice president and national sales manager for Microphor, Inc., John M. Mayfield Jr., president of the company announced. Mr. Nail, who has been Eastern sales director for the firm since 1976, joined Microphor in 1972 as a sales representative. In his new capacity, he has assumed responsibility for Microphor's national marketing program and sales force. He is headquartered at 5005 Vernon Oaks Drive in Dunwoody, Ga.

Microphor manufactures waste sanitation systems, low flush toilets, and sewage treatment tanks for use in marine vessels.