38mm hose tail. 28mm OD fan centre boss. 52mm diagonal fan pulley bolt centres.
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YN4100QB, YN4100QBZ, YN4102QB. 38mm hose tail with 1/4 thread. 25mm OD bypass hose tail. 1/2...
38mm hose tail. 28mm OD fan centre boss. 52mm diagonal fan pulley bolt centres.