Final answer:
For connecting two female-sided pipes of different diameters, a reducer is the correct fitting. It allows one pipe to transition smoothly into another pipe of a different size, whereas other fittings like elbows, caps, and crosses serve different purposes.
Step-by-step explanation:
When it comes to connecting two female-sided pipes together, the correct type of pipe fitting to use would generally be a reducer. A reducer is used to join two pipes of different diameters, effectively allowing for connections between pipes of varying sizes. Let's review the options given:
- Elbow: This fitting is used to change the direction of the flow in a piping system.
- Caps: Caps are used to seal the end of a pipe.
- Crosses: Cross fittings are used to make four-way connections.
- Reducers: Reducers connect pipes of different diameters, accommodating the difference in size on either end.
Therefore, the answer to the question is option d. Reducers.