(a) 
         Each caulked bell and spigot joint in cast iron pipe must be sealed with mechanical leak clamps.
     
    
        
        (b) 
         Each mechanical joint in cast iron pipe must have a gasket made of a resilient material as the sealing medium. Each gasket must be suitably confined and retained under compression by a separate gland or follower ring.
     
    
        
        (c) 
         Cast iron pipe may not be joined by threaded joints.
     
    
        
        (d) 
         Cast iron pipe may not be joined by brazing.
     
    [35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-62, 54 FR 5628, Feb. 6, 1989]