Answer Key: Self-Test D-1.3

1. Figure 2P-1

Table 1 Answers
Drains Name Vents Name
1 Trap arm — Fixture drain A Stack vent
2 Stack acting as a wet vent B Continuous vent
3 Fixture drain acting as a wet vent C Stack vent
4 Trap arm — Fixture drain D Continuous vent
5 Branch acting as wet vent E Continuous vent
6 Branch F Stack vent
7 Stack G Stack vent
8 Sanitary building drain H Vent header
9 Fixture drain acting as a wet vent
10 Branch
11 Fixture drain acting as a wet vent
12 Branch
13 Trap arm — Fixture drain
14 Branch
15 Sanitary building drain
16 Sanitary building drain
17 Stack
18 Branch
19 Sanitary building drain
20 Sanitary building drain
21 Sanitary building sewer

2. Figure 2P-2

Table 2 Answers
Drains Name Vents Name
1 Stack acting as a wet vent A Stack vent
2 Trap arm — Fixture drain B Stack vent
3 Stack C Branch vent
4 Fixture drain acting as a wet vent D Continuous vent
5 Branch E Continuous vent
6 Stack F Stack vent
7 Branch G Stack vent
8 Stack acting as a wet vent H Branch vent
9 Stack I Continuous vent
10 Sanitary building drain J Continuous vent
11 Sanitary building drain K Branch vent
12 Stack L Continuous vent
13 Branch M Branch vent
14 Sanitary building drain N Stack vent
15 Trap arm — Fixture drain O Stack vent
16 Branch P Continuous vent
17 Fixture outlet pipe Q Continuous vent
18 Trap arm — Fixture drain R Branch vent
19 Sanitary building drain S Stack vent
20 Sanitary building drain T Stack vent
21 Fixture drain acting as a wet vent U Dual and continuous vent
22 Trap arm — Fixture drain
23 Branch acting as a wet vent
24 Branch
25 Branch
26 Trap arm — Fixture drain
27 Branch
28 Stack
29 Branch
30 Sanitary building drain
31 Branch
32 Stack acting as a wet vent
33 Trap arm — Fixture drain
34 Sanitary building drain
35 Branch
36 Stack
37 Stack
38 Stack acting as a wet vent
39 Trap arm — Fixture drain
40 Trap arm — Fixture drain

3. Figure 2P-3

Table 3 Answers
Drains Name Vents Name
1 Branch A Circuit vent
2 Fixture drain acting as a wet vent B Relief vent
3 Stack C Branch vent
4 Branch acting as a wet vent D Vent stack
5 Fixture drain acting as a circuit vent and a wet vent E Circuit vent
6 Branch F Branch vent
7 Fixture drain acting as a relief vent G Vent stack
8 Branch acting as a wet vent H Continuous vent
9 Stack I Branch vent
10 Trap arm — Fixture drain J Continuous vent
11 Branch K Individual and continuous vent
12 Fixture drain acting as a vent stack and a wet vent L Individual vent
13 Trap arm — Fixture drain M Branch vent
14 Fixture drain acting as a wet vent N Vent stack
15 Stack O Stack vent
16 Sanitary building drain P Vent header
17 Branch acting as a wet vent Q Vent header
18 Branch R Vent header
19 Trap arm — Fixture drain S Stack vent
20 Sump discharge T Vent stack
21 Stack acting as a wet vent U Continuous vent
22 Trap arm — Fixture drain V Continuous vent
23 Stack W Vent stack
24 Fixture drain acting as a wet vent X Circuit vent
25 Branch Y Continuous vent
26 Stack Z Dual and continuous vent
27 Branch AA Vent stack
28 Trap arm — Fixture drain AB Vent stack
29 Stack AC Continuous vent
30 Branch AD Branch vent
31 Fixture drain acting as a vent stack and a wet vent AE Continuous vent
32 Branch acting as a vent stack and a wet vent AF Sewage sump vent
33 Branch
34 Stack
35 Sanitary building drain
36 Sanitary building drain

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Block D: Drainage Systems Copyright © 2025 by Skilled Trades BC, Thompson Rivers University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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