Rewindable water-filled motor, NEMA coupling, available both in 2-pole and 4-pole versions; entirely designed and produced by SAER. Exclusive shaft seal system as standard which allows use even in unfavourable conditions: bidirectional mechanical seal + sand seal. Reliability also ensured by the presence of the compensation membrane which balances the internal and external pressure as the volume of water varies. Motors available with PVC insulated winding as well as PE+PA for use with hot water (up to 50°C).