Water circulating pump - the large silver screw in the middle

[Rollerball]

I have a spare, old water circulating pump, a Grundfos 15-50, like this:

https://www.anchorpumps.com/media/catalog/product/cache/adc97c95711116b76690f2d96fb29368/l/e/leoldshite_1.jpg

About that silver screw in the middle, can it be obtained separately? It's missing from the old 'parts' pump.

 

[Exedon]

I had quite a number till this morning now they are at local scrap yard.

 

[ATTQ]

That is an interesting variation on the phenomena of needing something shortly after I've eventually decided to throw it out

 

[CountryFan]

If you need it for yourself then could it be taken from the existing one? Afaik they’re not available as a spare, but think I have a few screws from Grundfos boiler pumps, not sure if the screw size is generic.

 

[Rollerball]

Thanks all..

As the newer pump is a different make and model I'm assuming that the screw may be a different length, width and/or have a different thread pitch, however I can't take it out to check because I'll probably end up with water everywhere.