Kor-Flo™ PVC Access Risers provide access to tanks and are used as valve enclosures in water and wastewater systems. Bulk
pipe quantities are available. Bolt catches are available for securing
Orenco® DuraFiber™ or FL-Series fiberglass lids to access risers.
Step 1: Determine the diameter of the riser needed for your application:
Note: We recommend a 30-in. diameter riser when the depth is greater than 3 ft.
Step 2: Verify that the riser diameter is compatible with the riser tank adapter and tank hole size.
Step 3: Determine the height of the riser. The top of the riser should extend a minimum 3 in. above the
finished grade level.
Note: This includes 2 in. for settling in new installations. For existing installations, only
1 in. above grade is necessary.
Step 4: Determine requirements for splice box and grommet. For grommets used with internal splice boxes,
determine the nipple size being used, either 1 in. or 1-1/4 in. SB1 through SB4 requires a 1-in.
grommet. SB5 and SB6 require a 1-1/4-in. grommet. Standard location for internal splice boxes is
6 in. down. External splice boxes require a 4-in. grommet 6.25 inches down. Discharge grommet is
18 in. down for tall risers (≥ 24 in.) and 6 in. up from the bottom for short risers (< 24 in.).