[Analog pH Sensor][SKU:SEN0169] screw cap spec.

I bought three products.

- Gravity: Analog pH Sensor / Meter Pro Kit For Arduino [SKU:SEN0169]
- Gravity: Analog pH Sensor / Meter Kit For Arduino [SKU:SEN0161]
- Gravity: Analog Dissolved Oxygen Sensor / Meter Kit For Arduino [SKU:SEN0237-A]

However, the screw cap for the BNC connector is included only in [SKU: SEN0237-A].

Other products,
Screw caps for BNC connectors were not included. So I have to buy.

I have a question.

What is Spec of screw cap for BNC connector?

Or where can I buy it?
This is Korea.
I expect to be able to purchase it online.