Comparison : Item # 21415, Constant-Flow Connector, HP, without belt
Item # 04430, Belt
Item # 04397, Respirator hose, 3/8" x 25 ft (alternate)
Item # 04415, Respirator hose, 3/8" x 50 ft (alternate)
Item # 04398, Respirator hose, 3/8" x 100 ft (alternate)