A receiver adapter, plain bend, is a type of laboratory glassware accessory used to connect a receiver flask to a condenser or other glassware component at an angle. It consists of a bent tube with a socket at one end that fits onto the neck of the receiver flask and a cone at the other end that fits into the joint of the condenser or other component.

The plain bend design of the adapter allows for a more ergonomic and flexible setup, making it easier to access and manipulate the components. The receiver adapter, plain bend, is commonly used in chemical experiments, especially in the areas of distillation and reflux, where it is important to have a secure and leak-proof connection.

The adapter ensures a tight seal between the glassware components, minimizing the risk of leakage or contamination during the experiment. The bent design of the adapter also provides a clear line of sight for observation and measurement, making it easier to monitor the progress of the experiment.