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   The material of the gasket :    ---for cold water(the temperature of water is not more than 50℃):NBR    ---for hot water(the temperature of water is not more than 90℃):SIR   OVERALL DIMENSIONS 
 
 
|  Description |  Unit |  Dimensions |  
|  Nominal size | mm  | 15  | 20  | 25 |  32 | 40  | 50  |  
|  A | mm |  24.2 |  30.5 |  39.2 |  44.7 |  56.5 | 72 |  
|  B | mm |  17 |  22 | 28  | 35  | 42  | 52  |  
|  S | mm |  2.5 | 2.5  | 3  | 3  | 3  | 3  |  |