Laundry tubs, or wash trays, are made of porcelain, enameled cast iron, soapstone, slate, and artificial stone.
The connections for this fixture are shown in Plate I. The waste outlet from each section of the laundry tubs should be 1 1/2 inches in size. The main waste and trap for a two-part laundry tub may be 1 1/2, inches, and for laundry tubs of three to six sections, the main waste and trap should not be less than 2 inches in size.
The vent from the trap of a set of laundry tubs should not be less than 1 1/2 inches in size.. Formerly this fixture was made of wood, the several sections sometimes being lined with sheet metal. The use of the wooden laundry tubs or wooden sink should be prohibited, as the wood readily absorbs moisture and filth, and the fixture soon becomes unsanitary.
For use in general work, such as for dwelling houses, and the less pretentious residences, laundry tubs either of slate or soapstone give excellent service.
Laundry tubs of artificial stone are much used in the cheaper grades of work, but often have the disadvantage of cracking and crumbling, especially if installed in cold places, where frost may work into the stone. A strong cement for mending artificial stone, slate, and soapstone tubs may be made of litharge and glycerine formed into a paste, which is very hard when it has set, and very durable.
In many instances, especially in flats and apartment houses, the laundry tubs are located in the kitchen, close to the sink. When so located, it is customary in some sections to allow one trap to serve both fixtures. This is considered poor practice in any case, and especially when applied to such fixtures as the kitchen sink and laundry tubs. Each fixture should be separately trapped. Although the use of the drum trap is not popular in certain sections, in connection with laundry tubs it may be used to great advantage many times, for it can usually be located more advantageously than the S trap, and is of sufficient diameter to easily receive any number of waste pipes that may be required to enter it. In its use, a less length of fouled waste connection to the trap is able to throw impure odors into the room than in such a connection as shown in Plate I.
When the kitchen sink and laundry tubs are each to be located in the kitchen, and especially when it is necessary to economize space, the combination kitchen sink and laundry tub may be used to advantage. This fixture combines the two fixtures in one.