Fully welded nipple cannot break off like cheaper shells. The Surge Jet Flo Shell is commonly used by dairyman in the United States. The stainless steel, tapered body design, unique to the Jet Flo shell, helps form the inflation to better fit the udder while improving vacuum flow between the liner and the shell. The barbed inlet secures the air tube firmly in place. The Jet flow shell accommodates agood selection of inflations providing the dairyman a wide range of options in matching the Jet Flo shell to the appropriate inflation. This shell has been a popular addition to the Parts Department product line.