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What is a suitable substitute APS for obsolete Glow Worm Spacesaver boiler?

I am in need of an Air Pressure Switch for my Glow Worm Spacesaver 20-30F boiler. The boiler is no longer supported and the original part 202050 (Glow Worm part 419623 or G.C. part 381799) appears to be unobtainable.
Any ideas what would be a suitable substitute?
A part number would be a great help.

Thanks
Mr Brown, November 2008
Glow Worms part number for the item is now 800853

Mr Brown, November 2008
have you tried glow worm technical
Technical Help: 01773 828300

b, November 2008
link Click here to see other fixes for Glow Worm Spacesaver 20-30F.