Specific subunit of the TRAPP (transport protein particle) II complex, a highly conserved vesicle tethering complex that functions in late Golgi trafficking as a membrane tether. TRAPPC14 is dispensable for TRAPPII complex integrity but mediates RAB3IP preciliary vesicle trafficking to the mother centriole during ciliogenesis. Modulates YAP1 activity as transcriptional regulator. Component of the multisubunit TRAPP II complex, which includes at least TRAPPC1, TRAPPC2, TRAPPC2L, TRAPPC3, TRAPPC4, TRAPPC5, TRAPPC6A/B, TRAPPC9, TRAPPC10 and TRAPPC14. TRAPPC9, TRAPPC10 and TRAPPC14 are specific subunits of the TRAPP II complex. Interacts with alpha-tubulin during mitosis. Interacts with RAB3IP (via the N-terminal region); this interaction mediates RAB3IP association with the TRAPP II complex. Interacts with TRAPPC10. Interacts with FBF1. During mitosis, precedes alpha-tubulin in gap formation of cell abscission at the midbody and is co-localized with PLK1 at the edges of microtubules extensions of daughter cells post cytokinesis abscission. Colocalizes with RAB3IP on preciliary vesicles. Truncated N-terminus.