Exhibit 21

PREFORMED LINE PRODUCTS COMPANY

SUBSIDIARIES

Domestic Subsidiaries:

     Superior Modular Products Incorporated
                      Asheville, North Carolina

     Direct Power and Water Corporation
                      Albuquerque, New Mexico

Foreign Subsidiaries:

     Australia

Preformed Line Products (Australia) Ltd.
Sydney, Australia

     Brazil

PLP-Produtos Para Linhas Preformados Ltd.
Sao Paulo, Brazil

     Canada

Preformed Line Products (Canada) Ltd.
Cambridge, Ontario, Canada

     China

Beijing PLP Conductor Line Products Co., Ltd.
Beijing, China

     Mexico

Preformados de Mexico S.A. de C.V.
Queretaro, Mexico

     Poland

PLP-Belos SA
Beilsko-Biala, Poland

     South Africa

Preformed Line Products (South Africa) Pty. Ltd.
Pietermaritzburg, Natal
Republic of South Africa

     Spain

APRESA — PLP Spain, S. A.
Sevilla, Spain

     Thailand

Preformed Line Products (Asia) Ltd.
Bangkok, Thailand

     United Kingdom

Preformed Line Products (Great Britain) Ltd.
Andover, Hampshire, England