(19)

(11)

EP 0 572 468 A1

(12)

(43) Date of publication: 08.12.1993 Bulletin 1993/49 (21) Application number: 92904882.0 (22) Date of filing: 20.02.1992

(51) International Patent Classification (IPC):  E03C 1/ 22( . ) E03C 1/ 298( . ) E03C 1/ 288( . ) F16K 15/ 14( . ) (86) International application number: PCT/GB1992/000297 (87) International publication number: WO 1992/014888 (03.09.1992 Gazette 1992/23)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 21.02.1991 GB 19910036814 (71) Applicant: AC DEVELOPMENTS LIMITED Braughing, Hertsfordshire SG11 2NS (GB)	(72) Inventor: COLE, Alan, Charles Molecroft Braughing Friars Herts SG11 2NS (GB) (74) Representative: Lerwill, John, et al  A.A. Thornton & Co. Northumberland House 303-306 High Holborn London, WC1V 7LE London, WC1V 7LE (GB)