Measurement Guide

Selecting the right model
Use the chart below and visit our septic tank riser page to find the riser model that is right for you.
Frequently Asked Questions
Can the riser be cut down or altered on site?
No. The kits are only available in 3" increments starting at 7" tall up to 50" tall. Call us for custom heights greater than 50”.
Should the kit be positioned above, at, or below grade?
The height is matter of preference. The kits are watertight and can be setup with the cover above, at, or below grade.
Do you remove the existing septic tank cover?
Generally, most homeowners remove the existing cover for ease of access in the future. Depending on the dimensions of the
existing lid, this step may be required. Our kits provide a water tight seal to the tank. The low-profile cover secures down with
several screws & there's also a secondary safety barrier included as well to ensure our kits provide safe access to the septic
tank.
Can I drive my lawn equipment and/or utility vehicle over the kit?
No. We recommend avoiding any substantial loads from machinery directly on the kit. The septic tank cover is designed for
occasional foot traffic areas. For applications in high traffic areas the cover should be inspected every 6 months for deterioration
and replaced at least every 3 years.
My opening is square, not circular, will this system still work?
Our kits were designed to fit most styles of opening shapes (e.g. round, square, rectangular, etc.) given the opening is within
certain parameters. The base flange will fit up to a 24” circular or squared opening.
TOP VIEW
30 ¼” Sq.
Nominal
Riser
Height “B”
MODEL RISER HEIGHT “B”
AS-R07 7⅛”
AS-R10 10⅛”
AS-R13 13⅛”
AS-R16 16⅛”
AS-R19 19”
AS-R23 23”
AS-R26 26”
AS-R29 29⅛”
AS-R32 32⅛”
AS-R35 35⅛”
AS-R38 38⅛”
AS-R41 41⅛”
AS-R44 44⅛”
AS-R47 47⅛”
AS-R50 50⅛”
SIDE VIEW
Inside Diameter “A”
24” Nominal