The Gorman‑Rupp RD & RS Series (Roto‑Prime®) pumps are heavy‑duty self‑priming centrifugal pumps built to provide dependable and efficient fluid handling in challenging wastewater, sewage, and industrial applications. At the core of these pumps is Roto‑Prime®, a patented self‑priming system that automatically evacuates air from the suction line and maintains prime without the need for external priming equipment or special foot valves.

This automatic self‑priming capability makes the RD & RS Series ideal for installations where suction lines may contain air, gas pockets, or frequent dry starts — including lift stations, bypass pumping, construction dewatering, and stormwater management. The Roto‑Prime® system reliably re‑primes the pump after loss of prime, enhancing uptime and reducing operational interruptions.

Both RD and RS models are engineered with robust solids‑handling hydraulics that enable the passage of wastewater and solids‑laden liquids with minimal clogging. The RS Series typically includes enhanced solids management features, improving performance when handling fibrous or stringy materials.

Built with heavy‑duty materials and designed for ease of service, RD & RS pumps offer field‑friendly maintenance with accessible wet‑end components that can be serviced without disconnecting piping. Durable seals, wear‑resistant impellers, and rugged casings contribute to long service life even in abrasive or corrosive environments.

Key Features:

• Patented Roto‑Prime® automatic self‑priming technology

• Reliable solids‑handling centrifugal design

• Suitable for wastewater, sewage, and industrial fluids

• Quick re‑prime after loss of prime

• Heavy‑duty construction for extended service life

• Easy maintenance with accessible service points

The Gorman‑Rupp RD & RS Series (Roto‑Prime®) pumps provide a dependable, high‑performance solution where automatic priming and robust solids handling are essential, making them well suited for municipal, industrial, and construction pumping challenges.