It sounds like you’re looking for a Hardy Gold Top rubber stopper that’s approximately 8mm in diameter. Here’s what I can suggest:

Possible Solutions:
1. Check Hardy’s Official Website or Distributors

PROBLEY HARDY GOLD TOP RUBBER  STOPPER APPROX 8mm

– Hardy is a well-known brand in medical/lab supplies. Visit their official site or authorized dealers to find the exact product.

2. Search for Generic Alternatives
– If the Hardy brand is unavailable, search for “8mm rubber stopper gold top” on lab supply sites like:
– Fisher Scientific
– VWR International
– Amazon or eBay (for generic lab stoppers)

3. Verify Dimensions
– Ensure the 8mm refers to the inner diameter (ID) or outer diameter (OD) of the stopper, as this affects fit.

4. Contact Customer Support
– If this is for a specific device (e.g., medical equipment), reach out to the manufacturer for compatible stoppers.

Would you like help finding a specific supplier or confirming the exact specifications? Let me know!