The GRAF Infiltration shaft system is the final addition to the proven GRAF percolation modules and is perfectly coordinated for use with the Rain bloc and tunnel.

The Infiltration shaft system basically compri- ses an inlet and distributor module of either DN 400 or DN 600 in diameter. The approp- riate cover can be selected depending on the load class required (up to class D).

Shaft extensions between the two main modules (also above the inlet module with the DN 600 diameter version) ensure a simple connection even for percolation systems with high earth coverings.

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