The invention is a bi-zone water transport plate for a fuel cell wherein the plate includes a water permeability zone and a bubble barrier zone. The power line phase coupler system includes a housing, a female connector positioned within the housing, a male connector electrically connected to the female connector by a length of cord, and a repeater coupler electrically connected to the male connector. The photomask blank includes, on the digging-side surface of the light-transmitting substrate, an etching mask film that is made of a material being dry-etchable with a chlorine-based gas, but not dry-etchable with a fluorine-based gas, and serves as an etching mask at least until, when forming the dug-down part by dry etching, the dry etching reaches the digging depth. The extensible layer 106 is anchored to at least one laminar layer 102, 104 by lines of spread adhesive 108, 108\u2032.