Fig. 108 gives a perspective view of one style of this type of tank attached to a siphon-jet closet. Figs. 109 and 110 give the details of the construction of two forms of this type of tank, both of which have given efficient service. The drawing shows the tanks with the front broken away to give a view of the working parts. The water enters the tank and is discharged at the points indicated. The float and supply valve works exactly as described in the high tank. The drawing in Fig. 109 shows the tank in the act of discharging. The discharge valve is raised as shown at _E_. When the water is completely discharged, the float occupies the position shown dotted. When the float reaches this dotted position, its weight pulls down the piece _A_. This releases the lever _B_, and the attached stopper _E_, which falls and closes the discharge orifice. While the tank is filling with water, a stream flows through the small pipe _D_, to replenish the water in the closet that has been discharged in siphoning. When the tank is full of water, the pieces _A_ and _B_ occupy the positions shown dotted. To discharge the tank the _trip_ is pushed down. This action raises the lever to the position _B_, and with it the attached stopper _E_. The piece _C_ falls and the opposite end _A_ holds _B_ suspended until the tank is completely discharged. [Illustration: FIG. 108.--Siphon-jet closet with low-down tank.] [Illustration: FIG. 109.--Details of construction of low-down flush tank.] The action of the tank shown in Fig. 110 is the same as the others except that of the discharge mechanism. In the drawing, the tank is full of water ready to be discharged when required. A hollow rubber ball _E_ serves as a stopper for the discharge pipe. The ball is kept in place, when the tank is filling, by the pressure of the water above it. The discharge is started by pressing down the trip on the front of the tank. This raises the ball from its seat, and being lighter than water, it floats, thus leaving the discharge pipe open until the tank is empty, when the ball is again back on its seat. As the tank fills the pressure of the water above prevents the ball from again floating, until lifted from its seat. The supply valve and refilling pipe _D_ is the same in action as in the other tank. [Illustration: FIG. 110.--Details of construction of the float-valve, low-down flush tank.] [Illustration: FIG. 111.--Method of using the plumber’s friend, in removing obstructions.] =Opening Stopped Pipes.=--It occasionally happens that pipes leading from the various toilet fixtures become stopped because of accumulations or by articles that accidentally pass the entrance. In case the pipe has a trap connection the stoppage is most likely to occur at that point. Usually the obstruction may be removed by detaching the screw-plug of the trap and removing the accumulation with a wire.