Water tank structure and gas installation cad drawing details that includes a detailed view of method of fixing water gauge meter for domestic aise withing the cavity of boundry wall, septic tank plan details, elevation and all sided sectional details, dimensions details, manhole plan details, water depth detail, memory of material details, structure detail with inst. tap, nickel-plated bronze swan neck wrench, gas socket with bronze piton, Contrazocalo tile, stainless steel laundry, white mayolica, mayolica cut, porcelain filling, rubber protector, stainless steel laundry, for hose connection, simple union and much more of installation details.