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			aaah yes I see they are. The ones at our club are inside of a concrete box  with heavy wooden doors that are padlocked closed when not in use. 
		
		
		
		
		
		
			
		
		
		
		
		
	
	I am not totally sure but I think they made the concrete house for ours with plywood forms but I would say you could do it a lot easier with cinder blocks and porage over top the blocks and paint with waterproofing tar or something.  | 
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