Various embodiments of a longitudinal fitting or other fluid conduit for a piping system are provided. The fitting can comprise a body including a first portion, a second portion, and a barrier between the first and second portions. The first portion can include a first inner surface that defines a first opening that is sized and configured to receive a first piping system component. In various embodiments, the barrier can be positioned between the first inner surface and a second inner surface of the second portion; the barrier can at least partially define a reservoir. When the first piping system component is secured to the fitting by a securing liquid, such as solvent cement, the barrier and/or reservoir can resist the liquid from reaching the second inner surface, thereby reducing the likelihood that the second inner surface will become damaged or otherwise compromised by chemically reacting with the securing liquid.