Enables guanyl-nucleotide exchange factor activity. Acts upstream of or within negative regulation of cardiac muscle cell apoptotic process; positive regulation of phosphatidylinositol 3-kinase signaling; and regulation of Ral protein signal transduction. Is expressed in several structures, including alimentary system; genitourinary system; hemolymphoid system gland; integumental system; and nervous system. Orthologous to human RGL2 (ral guanine nucleotide dissociation stimulator like 2). [provided by Alliance of Genome Resources, Apr 2022]