Owner manual
ES-WD-OI-ST USA 1345 OI-ST
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SPECIFICATION: Watts Drainage OI-ST Series recessed or floor mounted epoxy coated steel oil interceptor with integral
storage tank, gasketed epoxy coated steel skid-proof cover secured with hex head center bolt(s), deep seal trap with
cleanout, draw-off connection and dual vent connections, sediment bucket, integral stainless steel flow control plate,
and no hub (standard) connections. **Check local plumbing code for oil storage requirements prior to installation.
Oil Interceptor with
Integral Storage Tank
OI-ST
Options (Select One or More)
Suffix Description
-E
Extension
-O
Inlet & Outlet other than
Standard Size
-SS
Stainless Steel
-THD
Threaded Connections
-HD Heavy Duty (10,000 lb.)
Traffic Cover
-US Buy American Compliant
LEFT SIDE
OUTLET
TRAP
RIGHT SIDE
2” NH VENT
SEDIMENT BUCKET
INLET
TOP VIEW
A
INTERCEPTOR
OIL STORAGE TANK
K
H
DRAW-OFF
CONNECTION
3/8
ELEVATION
3 3/8
ACCESS COVER
D
10 GPM
10
15 GPM 15
20 GPM 20
25 GPM25
Flow Rate (Select One)
Suffix Description
35 GPM 35
50 GPM50
75 75 GPM
100
100 GPM
125 125 GPM
150
150 GPM
200
200 GPM
250
250 GPM
300
300 GPM
350 350 GPM
400 400 GPM
450
450 GPM
500
500 GPM
OI-10-ST
OI-15-ST
OI-20-ST
OI-25-ST
OI-35-ST
OI-50-ST
OI-75-ST
OI-100-ST
OI-125-ST
OI-150-ST
OI-200-ST
OI-250-ST
OI-300-ST
OI-350-ST
OI-400-ST
OI-450-ST
OI-500-ST
MODEL
NO.
SIDE VIEW
INLET
INTERNAL
FLOW CONTROL
OUTLET
E
C
F
B
G
FLOW
RATE
GPM
10
15
20
25
35
50
75
100
125
150
200
250
300
350
400
450
500
26.5” (673)
15
22
32
35
65
78
214
303
345
358
453
590
816
1068
1111
1115
1242
COMBINED
VOLUME
USG
A
B
C D
E F
G
H
K J
INLET &
OUTLET
BASE TO
CENTER
TOP TO
CENTER
LENGTH WIDTH
HEIGHT
2” (51)
2” (51)
3” (76)
3” (76)
4” (102)
4” (102)
4” (102)
4” (102)
4” (102)
4” (102)
4” (102)
4” (102)
6” (152)
6” (152)
6” (152)
6” (152)
6” (152)
6” (152)
8.5” (216)
12.5” (318)
14.5” (368)
16.5” (419)
14.5” (368)
18.5” (470)
26.5” (673)
28” (711)
30” (762)
30.5” (775)
35.5” (902)
36.5” (927)
43.5” (1105)
43” (1092)
43” (1092)
46” (1168)
6” (152)
6” (152)
6” (152)
6” (152)
6” (152)
6” (152)
6” (152)
9.5” (241)
12” (305)
14” (356)
17.5” (444)
15.5” (394)
15.5” (394)
16.5” (419)
17” (432)
17” (432)
20” (508)
24” (610)
33.75” (857)
39.75” (1010)
39.75” (1010)
49.75” (1264)
49.75” (1264)
49.75” (1264)
90” (2286)
90” (2286)
90” (2286)
90” (2286)
76” (1930)
86” (2184)
94” (2388)
91” (2311)
83” (2108)
83” (2108)
18” (457)
20.875” (530)
20.875” (530)
20.875” (530)
32.875” (835)
32.875” (835)
40.875” (1038)
58” (1473)
62” (1575)
66” (1676)
73.25” (1860)
73.25” (1860)
94.875” (2410)
100.875” (2563)
107.875” (2740)
118.875” (3020)
118.875” (3020)
14.5” (368)
18.5” (470)
20.5” (521)
22.5” (572)
20.5” (521)
24.5” (622)
32.5” (826)
36” (914)
40” (1016)
44” (1118)
48” (1219)
51” (1295)
52” (1320)
60” (1524)
60” (1524)
60” (1524)
66” (1676)
3” (76)
5” (127)
6” (152)
7” (178)
6” (152)
8” (203)
16” (406)
20.5” (521)
22” (559)
24” (610)
24.5” (622)
29.5” (749)
29.5” (749)
36.5” (927)
36” (914)
36” (914)
39” (990)
4.5” (114)
4.5” (114)
4.5” (114)
4.5” (114)
12” (305)
12” (305)
12” (305)
15” (381)
16” (406)
17” (432)
18” (457)
18” (457)
23.5” (597)
24” (610)
26” (660)
30” (762)
30” (762)
5.5” (140)
7.5” (191)
7.5” (191)
7.5” (191)
6” (152)
6” (152)
12” (305)
20.5” (521)
22” (559)
24” (610)
25” (635)
22.5” (572)
25” (635)
33” (838)
35” (889)
38” (965)
42” (1067)
42” (1067)
6” (152)
9” (229)
10.4” (265)
10.4” (265)
13” (329)
13” (329)
13” (329)
22.5” (572)
19” (483)
22.5” (572)
22.5” (572)
21.5” (546)
23.5” (597)
22.75” (578)
20.75” (527)
20.75” (527)