Expert since 1970

Penstock 4sides tight for manhole

1 – Scope of use:

Retention device to suit to round opening in manholes.

With open-closed function and intermediate adjustment, with sealing on both sides, upstream and downstream water pressure.

2 – Technical characteristics :

Frame with curved bottom U-profile to fit to the curved bottom manhole.

Frame mounted  on to the concrete wall with removable extruded sealant gaskets fixed in the frame. Tightness through the sealant gaskets is achieved by wedges.

Sealing between the frame and the work is ensured by a self-adhesive rubber-foam gasket (supplied). Plate lifting by non-rising trapezoidal threaded rod.

3 – Dimensions – on request :

To suit DN 150 to DN 500.

Larger dimensions on demand.

4 – Types of drives :

  • Drive mounted inside manhole type AS
  • Drive mounted on headstock type AF


The materials used in the basic version for the various equipment and accessories are as follows:

1 – Frame, plate, shaft extension, wall fixing bracket and headstock

Steel- galvanized (St-37) DIN 1.0037
Stainless Steel (304) DIN 1.4301
Stainless Steel (316TI) DIN 1.4571
Aluminium (AlMg3) DIN 3.3535
Cast iron (GG25)



Other material on demand.

2 – Bolts and nuts

Stainless steel V4A

3 – Sealant gaskets

EPDM / APTK – Éthylène – Propylène – Terpolymère – Caoutchouc NBR – Acrylonitrile Butadiène

Rubber  CR – Néoprène – Polychloroprène – Rubber.

4 – Threaded shaft, rod

Stainless steel (V2A)  DIN 1.4104
Stainless steel (V2A)  DIN 1.4301
Stailess steel (316TI) DIN 1.4571

5 – Mother piece for shaft

Bronze – RG7  2.1090 – RG7 – Cu Sn 7 Zn  Pb

6 – Compression and sliding shims

PA –  Polyamide, PE – Polyéthylène, POM – Polyoxyméthylène

Bronze – RG7  2.1090 – RG7 – Cu Sn 7 Zn  Pb

7 – Dowel – anchors

Stainless steel V4A ( approved)

Contact us for a quotation

All tailor-made solutions available