Structural component of the gap junctions (By similarity). Plays a role in oocyte directional transit in the spermatheca during ovulation by facilitating the directional propagation of the calcium signal in the spermatheca (PubMed:23671426). Plays a role in male tail tip morphogenesis (PubMed:21408209). Expressed in hyp8-11 tail tip cells during the L4 larval stage. RNAi-mediated knockdown causes defective oocyte transit through the spermatheca. Calcium oscillations triggered during ovulation are random resulting in uncoordinated spermatheca constrictions. Oocytes enter the spermatheca normally but change direction several times before returning into the gonad or proceeding into the uterus. RNAi-mediated knockdown disrupts tail tip morphogenesis resulting in retention of the pointed larval tail tip in adult males (also known as the Lep phenotype) (PubMed:21408209). Belongs to the pannexin family.