Bell Forced Air Quick Lock (V.10) Adapter - 90 Degree NASA-Off The larger 4mm hole is

The larger 4mm hole is used with Bell SRV-style shields

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Bell Forced Air Quick Lock (V.10) Adapter - 90 Degree NASA-Off The larger 4mm hole isThe Bell Forced Air Quick Lock adapter allows the use of standard 1. 5" Forced Air hoses with Bell Helmets equipped with V. 10 Quick Lock nozzles. Flexible construction is easy to install, with the Quick Lock adapter easily snapping onto the helmet. 90 Degree design allows for more efficient hose routing in tight spaces.