Product Overview

The Flojet 4000 Series Demand Pump – 12V (R4300-500A) was a compact and efficient diaphragm pump designed for liquid transfer, spraying, and dispensing. It featured a Santoprene diaphragm, Viton check valves, and polypropylene housing, with an integrated pressure/demand switch for automatic operation.

⚠️ Please note: As of September 2025, this model is no longer in production. Flojet has transitioned to the Versijet 4-Chamber Pump Series, engineered with the same mounting footprint and port dimensions for easy replacement.

Key Features (4000 Series – R4300-500A)

✅ 3.1 Bar switch setting
✅ 14.0 L/min maximum flow
✅ 12V DC, 10.0 Amps
✅ Santoprene diaphragm & Viton check valve
✅ 1/2" hose barb ports
✅ Polypropylene pump housing
✅ Self-priming up to 2.4m
✅ Thermal overload protection
✅ Max fluid temperature: 54°C

Recommended Replacement: Flojet Versijet Series 4-Chamber Pump – 12V (Q351F-168S-2P)

Product Overview

The Flojet Versijet Q351F-168S-2P is the direct replacement for the discontinued 4000 Series R4300-500A. With a 4-chamber diaphragm design, it delivers smoother flow, increased efficiency, and longer service life. Built for versatility, the Versijet handles liquid transfer, spraying, circulation, and dispensing across industrial and agricultural applications.

Key Features (Versijet – Q351F-168S-2P)

✅ 4.1 Bar switch setting with internal bypass
✅ 13.2 L/min maximum flow
✅ 12V DC, 12 Amps
✅ Santoprene diaphragm & Viton check valve
✅ Glass-filled polypropylene housing
✅ Quick Connect ports with 1/2" hose barbs
✅ Self-priming up to 2.4m
✅ Runs dry without damage
✅ Heavy-duty coated motor & co-moulded diaphragm for long life
✅ Operating temperature range: 4–60°C

Why Upgrade to Versijet?

The Flojet Versijet Series is a direct-fit replacement for the old 4000/Quad Series, meaning you can swap it in without modification. With enhanced efficiency, quieter performance, and improved durability, it is the ideal upgrade for users of the R4300-500A.