Similar arrangements to those shown in figs. 28 and 29 are often adopted for butlers' sinks and wash-tubs, but the grating is placed at a lower level, so as to leave a socket above it for the reception of the plug. Fig. 32 shows an improved form of plug and washer for large sinks or baths; the diameter of the plug and grating is 3 in., diameter over flange 4 1/2 in., diameter over screw 3 1/2 in., and the outlet tail is either 3 in. bore throughout or tapered to 2 1/4 in., the latter being preferable. If a tail-piece has been formed in the fireclay, the device shown in fig. 33 may be used. Fig. 26, page 44, shows the common form of waste for lead-lined sinks; the plug is of the type known as "sunk," the stud and chain-ring being in the sunk portion of the plug, so as not to project above the bottom of the sink. For wood sinks, the flange of the washer is sometimes square and fixed with four screws, one at each angle.

Fig. 33. Plug-Waste to fit Fireclay Nozzle.

In the modification known as the "safety-plug" the plug can be raised, but cannot be withdrawn; with this plug a pull-up arrangement is required, which, by a quarter-turn, will hold the plug some distance above the washer, so that the water can escape. The waste and overflow shown in fig. 18, page 39, are extremely simple, and can be easily kept clean. Of course the same overflow can be used with an ordinary chain and plug instead of the spindle and safety-plug shown in the illustration.

In fireclay sinks with overflows formed in the body of the ware itself, after the manner illustrated in fig. 15, page 37, it is necessary to have an opening in the side of the brass washer to receive the 6verflow. Fig. 34 is a section of Twyfords' "Ruchill" hospital sink, showing the overflow in detail. This sink is made to stand clear of the wall and is glazed on the back. A loose enamelled fireclay plug or cover is provided for the top of the overflow. The form of washer for such an arrangement is shown in fig. 35, with union for lead pipe.

Fig. 34. Overflow of the "Ruchill" Sink.

Fig. 35. Plug-Waste with Washer for Overflow Tube.

India-rubber

Plug with

Metal Core.