Part of the H2 type VI secretion system (H2-T6SS) specialized secretion system, which delivers several virulence factors in both prokaryotic and eukaryotic cells during infection. Allows the delivery of the phospholipase effector PldB to target cells where it exerts its toxicity. Also plays a role in VgrG4b and its effector PldA secretion. Deletion leads to a complete loss of PldA, PldB and VgrG4b secretion. Belongs to the VgrG protein family.