In unfertilized oocytes, maintains egg-1 and egg-2 at the plasma membrane together with chitin synthase chs-1 and kinase mbk-2. Essential for the formation of a continuous and cohesive chitin layer following fertilization. Localizes around oocytes in the proximal region of the germline. RNAi-mediated knockdown causes the zygote to exit the spermatheca with a pinched morphology and to leave a trailing section behind. Zygotes have a fragmented chitin eggshell with an accumulation of chitin at one end of the embryo, causing polyspermy. In unfertilized oocytes, disrupts the homogenous distribution of cortical chitin synthase chs-1, pseudophosphatase egg-3 and kinase mbk-2 and causes the loss of egg-1 and egg-2 cell membrane localization resulting in their premature accumulation in cytoplasmic puncta.