Alternative to Whale Pipe Fittings?

[CJ13]

I need a replacement Whale fitting- WX1533B. This has is a female 1/2'' BSP brass thread /15mm push fit, for attaching Whale pipe to a Calorifier. This particular fitting seems to be available on special order only- the minimum order quantity is 40pcs @ £15 each, which seems extraordinary, but that's what F4 say.
Both John Guest and HepO make similar fittings- will they seal with Whale Pipe?

 

[Daverw]

Sounds like a standard plumbing fitting, DIY dept should have something on a single fitting or something you can join, 1/2bsp standard connection for anything from tanks to radiators

 

[PetiteFleur]

Try your local plumbing merchant, they'll be able to provide a fitting much cheaper(as it does not have 'Marine' in the description! Or maybe try ASAP Supplies.