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Exhibit 21

Entity Name

Domestic Jurisdiction

AERCO International, Inc.

New Jersey

AHC Holding Company, Inc.

Delaware

Apex Valves Limited

New Zealand

Australian Valve Group Pty Ltd

Australia

Avlis Haws do Brasil Ltda

Brazil

Bar pneumatische steuerungssysteme GmbH

Germany

Black Teknigas & Electro Controls Limited

United Kingdom

BLÜCHER France SARL

France

BLÜCHER Germany GmbH

Germany

BLÜCHER Metal A/S

Denmark

BLÜCHER Norway AS

Norway

BLÜCHER Sweden AB

Sweden

BLÜCHER UK LTD

United Kingdom

BM Stainless Steel Drains Limited

United Kingdom

Bradley Company, LLC

Wisconsin

Dormont Manufacturing Company

Pennsylvania

Electro Controls Ltd.

United Kingdom

Enware Pty Ltd.

Australia

Haws AG

Switzerland

Haws Corporation

Nevada

Haws Deutschland GmbH

Germany

Haws India Pvt. Ltd.

India

Haws Manufacturing Pte. Ltd.

Singapore

Haws Middle East DWC LLC

Dubai

HF Scientific, LLC

Florida

I-Con Systems Holdings, LLC

Florida

I-Con Systems, LLC

Florida

Industrial Company for Castings and Sanitary Fittings

Saudi Arabia

Intelligent Conservation Systems, LLC

Florida

Intelligent Water Solutions by Watts Inc.

Delaware

Josam Industries, LLC

Delaware

PVI Riverside Holdings, Inc.

Delaware

SDB IP Holdings, LLC

Delaware

Socla Valves and Controls Iberica SA

Spain

SteamCo Holdings, LLC

Kansas

Superior Boiler Technologies, Inc.

Kansas

Superior Boiler, LLC

Kansas

Superior Equipment Holdings, LLC

Kansas

Superior Holding, Inc.

Kansas

Taft Engineering, Inc.

Colorado

Tekmar Control Systems, Inc.

Washington

Tekmar Control Systems Ltd.

British Columbia

Traynor Family Enterprise

Nevada

Watts (Ningbo) International Logistics Co., Ltd.

China

Watts (Shanghai) Management Company Limited

China

Watts Asia Pacific Sales Pte. Ltd.

Singapore

Watts Automation – Valpes S.A.S.

France

Watts Benelux B.V.B.A.

Belgium

Watts Deutschland Holdings GmbH & Co KG

Germany

Watts Electronics S.A.S.

France

Watts EMEA Holding BV

Netherlands

Watts Germany Holding GmbH

Germany

Watts Heating and Hot Water Solutions LLC

Delaware

Watts Holdings Limited

Gibraltar


Watts Hydraulics – Socla S.A.S.

France

Watts Industries Bulgaria EAD

Bulgaria

Watts Industries Deutschland GmbH

Germany

Watts Industries France S.A.S.

France

Watts Industries Iberica S.A.

Spain

Watts Industries Italia S.r.l.

Italy

Watts Industries Middle East FZE

Dubai

Watts Industries Nordic AB

Sweden

Watts Industries Polska Sp. z.o.o.

Poland

Watts Industries Tunisia S.A.S.

Tunisia

Watts Industries UK Limited

United Kingdom

Watts Intermes GmbH

Austria

Watts Italy Holding S.r.l.

Italy

Watts Manufacturing LLC

Delaware

Watts Manufacturing Mexico, S. de R.L. de C.V.

Mexico

Watts Manufacturing MX GmbH

Switzerland

Watts Regulator Co.

Massachusetts

Watts U.K. Ltd.

United Kingdom

Watts Water Equipment Manufacturing (Ningbo) Co., Ltd.

China

Watts Water Quality and Conditioning Products, LLC

Delaware

Watts Water Technologies (Australia) Pty Ltd.

Australia

Watts Water Technologies (Canada), Inc.

Canada

Watts Water Technologies (HK) Holding Limited

Hong Kong

Watts Water Technologies Latin America S.A. de C.V.

Mexico

WWT International Holding B.V.

Netherlands