The SPS version of the FP4 series is designed to operate under the worst sandy conditions, maintaining the standard features of the series, with the distinctive characteristic of having the impellers locked onto the shaft with increased clearances to allow sand to pass through with less abrasion on wear components.

As standard, a non-return valve is not included.

Special steel and ceramic spacers fully protect the shaft. Shaft alignment is ensured by an oversized micro-cast steel support with an iron-rubber bushing and ceramic sleeves. Hydraulic performance is reduced compared to the standard pump in order to guarantee greater resistance under the extreme conditions for which it is designed.