(19)

(11)

EP 0 403 474 A1

(12)

(43) Date of publication: 27.12.1990 Bulletin 1990/52 (21) Application number: 88903847.0 (22) Date of filing: 09.05.1988

(51) International Patent Classification (IPC):  F16L 37/ 084( . ) (86) International application number: PCT/EP1988/000406 (87) International publication number: WO 1988/008938 (17.11.1988 Gazette 1988/25)

(84) Designated Contracting States: CH DE FR GB IT LI NL SE (30) Priority: 04.03.1988 IT 19880084108 (71) Applicant: CALEDONIA S.p.A. I-31058 SUSEGANA (Treviso) (IT)	(72) Inventor: ZANETTI, Paolo I-31015 Conegliano (IT) (74) Representative: Piovesana, Paolo  Corso del Popolo, 70 I-30172 Venezia-Mestre I-30172 Venezia-Mestre (IT)