Comparison : Item # 21415, Constant-Flow Connector, without belt
Item # 04430, Belt assembly, 2"
Item # 04397, Respirator hose, 3/s" x 25' (includes 7 & 8)
Item # 04415, Respirator hose, Vs" x 50' (includes 7 & 8)
Item # 04398, Respirator hose, Vs" x 100' (includes 7 & 8)