Ca reactor feed

[Delphinus]

Can you try a water filtration store or a specialized plumbing outfit? Here in Calgary a bunch of us shop for miscellaneous bits like that at a Pool pump place (it's called Western Pool & Spa, or Western Pool & Pump, or something ..... I dunno for sure). If you need to call around, ask if they have "John Guest fittings." Even if the piece you need isn't a "John Guest" fitting, odds are that if they have those, then they likely also have the piece you are looking for.

HTH!