![]() Discharge grommet is 18in down for tall risers (≥ 24in) and 6in up from the bottom for short risers (< 24in). External splice boxes require a 4in grommet 6.25in down. Standard location for internal splice boxes is 6in down. For grommets used with internal splice boxes, determine the nipple size being used, either 1in or 1-1/4in SB1 through SB4 requires a 1in grommet. Step 4: Determine requirements for splice box and grommet. For existing installations, only 1in above grade is necessary. Splice boxes must be located outside the pump system access riser and be. Note: This includes 2in for settling in new installations. Septic tanks, vaults, dosing tanks, other treatment components, risers and lids. The top of the riser should extend a minimum 3in above the finished grade level. Step 3: Determine the height of the riser. Step 2: Verify that the riser diameter is compatible with the riser tank adapter and tank hole size. Note: We recommend a 30in diameter riser when the depth is greater than 3ft. Effluent filters typically require a minimum 18in diameter access riser.Duplex pump systems require a 30in diameter access riser.They can be used as drain collection boxes or drop boxes. These same boxes are offered with a grate lid to be used in drainage applications. Simplex pump systems require a minimum 24in diameter access riser. 1-48 of 339 results for 'septic distribution box' Results Price and other details may vary based on product size and color. Risers are available to bring the access lid of the distribution boxes to grade.Step 1: Determine the diameter of the riser needed for your application: Bulk pipe available in 13ft (3.96m) sections for 12in and 18in nominal diameter (300mm and 450mm DN) pipe and in 14ft (4.27m) sections for 24in nominal diameter (600mm DN) pipe.Heights available in 3in (76mm) to 13ft (3.96m) nominal increments for 12in and 18in nominal diameter (300mm and 450mm DN) risers and to 14ft (4.27m) nominal increments for 24in nominal diameter (600mm DN) risers. ![]() ![]() Available in 12in, 18in, and 24in nominal diameters (300mm, 450mm, and 600mm DN).Ultra Rib Access Risers are used to provide access to tanks and also as valve enclosures in water and wastewater systems. ![]()
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