Polylok risers hold their shape, are stackable, screw together, and are water and airtight. Structural ribs inside prevent frost from adhering to the riser in frost prone areas.
 
 
 
Tired of digging to access your system? We've got you looked after!
Have plastic?
Plastic Risers
Plastic Replacement Lids
 
Have concrete but want to switch to plastic?
Universal adapter plate
20" adapter ring
24" adapter ring
 
 Adapter ring accepts either 20" or 24" Riser
Covers up to 25" square opening