What is the difference between a 8v1 and 12v1 tyre valve connector

This page explains the difference between a 8v1 and 12v1 (EM) tyre valve connectors.

PCL 12v1 Large Bore Euro Style Clip-On - Metro Sales

Tyre Valve Connectors

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PCL CO10H03 12v1 Screw-on Connector

What is the difference between a 8v1 and 12v1 tyre valve connector

Garage & Ancillary Equipment PCL Tyre Inflation Equipment

HSS Schrader Tyre Valve Thread round dies die 5V1 6V1 8V1 Right

CH3A01 Air Connector, Dual, Swivel, Open End, Rp 1/4 Inlet

Hromee Lock On Air Chuck, Heavy Duty Closed Flow Tire