ATEC Flap Valves type CIRTEC / RECTEC are constructions that prevent the backflow of water. These flaps are also used as protection against the ingress of small animals into the channel or pipe. 

Pipe socket with mounting flange for grouting or anchor bolting

Flap with reinforcement profiles according to the place of use

Several designs: plain flap, hollow-float flap or lever and counterweight flap

Adjustable pivot

Shock-absorbing sealing