In-Wall Duofix carrier system and Sigma concealed tank with actuator flush panel or pneumatic push button for wash down wall- hung toilets. System shall fit within minimum 31/2” (90 mm) framing wall or plumbing chase, with wood construction or steel framing members placed 193/4” (500 mm) apart. Framing members should be capable of supporting a 880 pound (400 kg) load without damage to the wall. Water supply shall have flow diameter no smaller than 1/2” (13 mm) copper tube, and a minimum flow pressure of 2 PSI (0.01 MPa). The toilet bowl shall be a third party listed, 2-hole wall-hung 1.6 GPF (6 LPF) or 1.28 GPF (4.8 LPF) single-flush, 1.6/0.8 GPF (6/3 LPF) or 1.28/0.8 GPF (4.8/3 LPF) dual-flush. The carrier frame shall be adjustable for bowl rim heights from 15” to 19” (381 to 483 mm). Actuator flush panels shall be diecast zinc, molded plastic or fabricated stainless steel and plated to preserve material integrity. All components shall be compliant with applicable codes and product standards.