How may a cleanout be attached to an S bath trap so that it will be accessible from the bath room without the removal of flooring?

Such a cleanout is shown in No. 5 in the illustration on page 105.

Is a cleanout on the trap vent of value?

It is needless to say that vents should be so constructed as to be free from stoppage, but as this has proved an impossibility, it would seem that a clean-out to enable the removal of such stoppage would be of value. It is to be considered, however, that even though the vent opening may need clearing out badly, its position is such that its condition is not known usually, and furthermore the average person does not understand its purpose, or how to remedy the trouble by means of it.

Continuous Venting.

What are the relative advantages of different waste and vent connections for drum traps?

In the illustration on page 105 we show nine different methods for this work. No. 6 represents probably the most common method. The chief objection to this method is the fact that if the gasket does not make tight, direct communication will exist. This will be the case also when the trap screw is taken out for cleaning. The chief advantage of No. 7 is that protection against the entrance of sewer gas is guaranteed even when the trap screw is removed. An objection, however, is that the outlet from the trap is liable to fill up. No. 8 overcomes the objectionable features of Nos. 6 and 7, but the pipe dipping down into the seal is an objection, as it presents additional opportunity for the collection of grease, etc. The' objection to a vent through the cleanout cover, as shown in No. 9, is that whenever the trap is cleaned the vent pipe must be twisted back, and furthermore air is brought in directly upon the seal, thereby increasing evaporation. The vent opening is very liable to fill up also.

The method of Fig. 10 is a poor one, for the reason that in the event of the stoppage of the vent, the trap will syphon almost as readily as an S trap. The danger of syphonage is averted by the method of No. 11, in which the upper end of the pipe inside the trap is left open. In this case, however, the same danger exists as with No. 1, and in addition the pipe inside acts as a means of collecting grease, etc., and eventually filling the trap. No. 12 shows a very good method, the cleanout being located at the bottom, so that when the gasket is not tight the fact is made known by leakage. The cleanout in this position also enables the contents to be cleaned out very readily. No.

13 shows the same advantage as No. 12, although the presence of the pipe inside the trap is objectionable. No. 14 shows an example of continuous venting, the advantages of which have been previously explained. Continuous venting applied to No. 12, we believe will make a very satisfactory method.

Is the local vent applied to other fixtures than water closets?

It may be used to advantage on slop sinks, and on urinals, especially in the case of the latter fixture when used in public toilet rooms.