Impeller Nut for Counter Current System Type STP - 7017376

Bosta – Impeller Nut for Counter Current System Type STP (Item No. 20)

This is the genuine Bosta replacement impeller nut (diagram position No. 20) designed specifically for the Bosta Counter Current System, type STP. It secures the impeller firmly onto the pump shaft, ensuring correct rotational engagement and preventing impeller dislodgement during operation. Replacing a worn or damaged impeller nut promptly restores full pump performance and protects surrounding components from wear.

Compatibility

This impeller nut is a factory spare part for the Bosta STP counter-current pump range. Always verify your system’s parts diagram (position No. 20) before ordering, as different STP variants or power ratings may use different hardware revisions. If in doubt, cross-reference your system’s model number and serial plate with your Bosta distributor.

Why Genuine Matters

Genuine Bosta parts are manufactured to the exact tolerances required by the STP pump internals. An incorrectly specified nut can lead to impeller imbalance, vibration, premature bearing failure, or motor damage — all of which are far costlier repairs than using the correct OEM fastener from the outset. Sourcing directly through an authorised Bosta stockist guarantees part authenticity and traceability.

Installation

Impeller nut replacement should be carried out with the pump fully de-energised and isolated from the electrical supply. Access to the pump internals typically requires disassembling the pump housing; follow the STP service manual for torque specifications and reassembly sequence. Professional installation by a qualified pool technician is strongly recommended to avoid damage to the impeller or shaft threads.