Exhibit 21 DIRECT AND INDIRECT SUBSIDIARIES OF WATTS INDUSTRIES, INC. ---------------------------------------------------------- DOMESTIC: Watts Investment Company [Delaware] Watts international Sales Corp [Massachusetts] Watts Finance Company [Delaware] Webster Investment Company [Delaware] Watts Regulator Company [Massachusetts] Watts Securities Corp. [Massachusetts] Rudolph Labranche, Inc. [New Hampshire] Watts Drainage Products, Inc. [Delaware] Anderson-Barrows Metals Corp. [California] Webster Valve, Inc. [New Hampshire] Jameco Industries, Inc. [New York] Ames Holdings, Inc. [Delaware] Watts Heatway Inc. [Delaware] Spacemaker Inc. [California] INTERNATIONAL: Watts Industries (Canada) Inc. [Canada] Watts Investment Company Canada Ltd. [Canada] Watts Cazzaniga S.p.A. [Italy] Cazzaniga Immobiliare S.r.l. [Italy] Idronica Line S.r.l. [Italy] Watts Industries Europe BV [The Netherlands] Watts Industries France SA [France] Watts Industries Europe GmbH [Germany] Wattsco International [U.S. Virgin Islands] Watts Ocean BV [The Netherlands] Watts Eurotherm SA [France] Watts U.K. Ltd [United Kingdom] Watts G.R.C. SA [Spain] Watts Intermes AG [Switzerland] Watts Intermes GmbH [Austria] Watts Italy Holdings S.p.A. [Italy] [formerly Watts Intermes S.p.A.] Watts Europe Services BV [The Netherlands] Watts M.T.R. GmbH [Germany] Anderson Barrows BV [The Netherlands] BV Philabel [The Netherlands] Watts AG [Switzerland] Watts Ocean NV [Belgium]