3M BT-30 breathing tube, adjustable lenght

The 3M™ Versaflo™ BT Air Hose is a highly durable breathing hose. A breathing hose is required to ensure that clean air reaches the hood. The breathing hoses are compatible with all 3M™ Versaflo™ Headgear and Air Supply Systems.
The QRS (Quick Release Swivel) breathing hoses can be connected quickly and easily.
Meets higher respiratory requirements with 3M™ hoods
A special fire-resistant sleeve extends the life of the hose and protects against flying sparks.