(19)

(11)

EP 0 576 488 A1

(12)

(43) Date of publication: 05.01.1994 Bulletin 1994/01 (21) Application number: 92906569.0 (22) Date of filing: 18.03.1992

(51) International Patent Classification (IPC):  F16L 33/ 22( . ) (86) International application number: PCT/GB1992/000478 (87) International publication number: WO 1992/016782 (01.10.1992 Gazette 1992/25)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 22.03.1991 GB 19910006172 (71) Applicant: WASK-RMF LIMITED Keighley, West Yorkshire BD21 5NA (GB)	(72) Inventors: SMITH, Trevor Reginald Ilkley, West Yorkshire LS29 9QZ (GB) WELFARE, Andrew Padiham, Lancashire BB12 8HN (GB) (74) Representative: Allman, Peter John, et al  MARKS & CLERK, Sussex House, 83-85 Mosley Street Manchester M2 3LG Manchester M2 3LG (GB)