The Geberit 109.304.00.5 is a UP320 concealed dual-flush tank for washdown WC. Concealed tank with actuator flush panel or pneumatic push button for residential washdown floor mounted toilets with rear water inlet toilets. System shall fit within 5 1/2" (146 mm) framing wall or plumbing chase. Framing members should provide support similar to 2" x 6" (51 mm x 152 mm) wood construction or steel framing members placed 19 3/4" (500 mm) apart. 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 low-consumption 1.6 GPF (6 LPF) or 1.6/0.8 GPF (6/3 LPF) dual-flush floor mounted toilet with rear water inlet type. Actuator flush panels shall be diecast zinc, molded plastic or fabricated stainless steel and plated to preserve material integrity. All component shall be compliant with applicable codes and product standards.