Where can I buy this transom boat plug?

[fishhaggis]

where can I buy these? One inch plastic screw for my Thunderjet boat plug. I simply can not find these. Help!

 

[MTboatguy]

Home Depot, Lowes, True value, Ace Hardware, it is a standard Plastic plumbing plug.

 

[Bondo]

Ayuh,...... Most likely just a 1/2" pipe plug,.....

I suggest ya buy a brass one, 'n ditch the plastic,......