Grade Rings and Grade Ring Inserts
Orenco® Grade Rings (GR, GRI) are used to provide a watertight extension to the height of an existing access riser or pump basin. The rings consist of an Orenco Grade Ring Insert and a section of riser pipe. Grade ring inserts can also be purchased separately. The PRTA24-2 Tank Adapter can function as a grade ring insert when used with self-leveling adhesive.
- ABS construction on inserts for 18-, 24-, and 30-inch (450-, 600-, and 750-mm) nominal diameter riser pipe
HOW TO SELECT
Step 1: Determine the diameter of the riser.
Step 2: Determine the height of the riser. The top of the riser should extend a minimum of 3 inches (76mm) above the finished grade level.
Note: For new installations, this includes 2 inches for settling. For existing installations, only 1 inch above grade is necessary.
Step 3: Determine the lid fastening method: either bolt catches or RLA adapter.