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This male-to-male connection fitting with 1 inch and 1-1/4 inch threads allows you to join pipes or components of different sizes in heating systems. It is commonly used in boiler and burner setups to adapt between various thread standards or to extend a line. The solid construction ensures a secure, leak-proof joint under operating pressures. Easy to install with standard tools, this fitting is a handy item for maintenance, repairs, or new installations where a size transition is needed.