OAC 310:257-9-33
Inspection and cleaning port, protected and secured
Cite as Okla. Admin. Code § 310:257-9-33
If a water tank is designed with an access port for inspection and cleaning, the opening shall
be in the top of the tank and:
(1) Flanged upward at least 13 mm (one-half inch); and
(2) Equipped with a port cover assembly that is:
(A) Provided with a gasket and a device for securing the cover in place, and;
(B) Flanged to overlap the opening and sloped to drain.