Comfortable Breathing can be obtained by a low pressure loss.
By the optimized design of air flow, in spite of the low pressure loss of approximately 50%, small & light weight can be achieved.
Also, it is possible to supply air to dry suit by making 3/8" port at the main body side.

Right: Adaptor TF (for check valve)
Left: Adator TM (for damper hose)

Example to engage with harness
Connected with Damper Hose (winth 3/8" male screw adaptor Adaptor TM)
Use 3/8" female screw adaptor (Adaptor TF) when using Auto Safety Lock Coupler.