Bell's forced air helmetS feature the new Quick Lock forced air nozzle that locks the forced air conector in place yet allows for easy release when its time to exit the vehicle. The smaller nozzle design helps accelerate airflow into the helmet. The Quick Lock nozzle can be used with traditional 1.5 inch diameter forced air hoses by using the air adaptor kits that connect the hose with the Bell Quick Lock nozzle.Straight Nozzle Adapter - BEL202900090 Degree Nozzle Adapter - BEL2029000