Help with blanking cap please (1 1/4 OD, 1 1/16 ID, 11 or 11 1/2 TPI)

[RobbieT]

Hello all,

Any help appreciated finding a blanking cap for the fitting with details below and photos attached.

The thread outside diameter is very close to 1 1/4 inch.
The thread inside diameter is very close to 1 1/16 inch.
The threads per inch is 11 or 11 1/2 TPI.

Thanks for any help,
Rob

 

[ShaunCorbs]

Looks like a 28mm nut

Wickes Compression Blanking Disc 28mm Pack 2 | Wickes.co.uk