Flojet 4000 Series Demand Pump – 12V (R4300-504A)

Product Overview

The Flojet 4000 Series Demand Pump – 12V (R4300-504A) was a high-capacity diaphragm pump widely used for spraying, liquid transfer, circulation, and dispensing. With a maximum flow rate of 19.5 L/min and a 3.1 Bar switch setting, it was a popular choice for agricultural and industrial applications.

⚠️ Important Notice: As of July 2025, this model has been discontinued. Flojet has replaced the 4000 (Quad) Series with the modern Versijet 4-Chamber Series, designed as a direct replacement with the same footprint and port sizes for hassle-free installation.

Key Features (4000 Series – R4300-504A)

✅ 3.1 Bar switch setting
✅ 19.5 L/min maximum flow
✅ 12V DC, 13.0 Amps
✅ Santoprene diaphragm & Viton check valve
✅ 3/4" hose barb ports
✅ Self-priming up to 2.4m
✅ Thermal overload protection
✅ Polypropylene housing
✅ Max fluid temperature: 54°C

Recommended Replacement: Flojet Versijet Series 4-Chamber Pump – 12V (Q451F-168S-2P)

Product Overview

The Flojet Versijet Q451F-168S-2P is the upgraded replacement for the discontinued R4300-504A. Featuring a 4-chamber diaphragm, this pump provides smoother operation, longer life, and improved reliability. With Quick Connect 3/4" hose barb ports and the same mounting footprint, it can be installed as a direct swap.

Key Features (Versijet – Q451F-168S-2P)

✅ 4.1 Bar switch setting with internal bypass
✅ 17.1 L/min maximum flow
✅ 12V DC, 14 Amps
✅ Santoprene diaphragm & Viton check valve
✅ Glass-filled polypropylene housing
✅ Quick Connect 3/4" hose barb ports
✅ Self-priming up to 2.4m
✅ Runs dry without damage
✅ Heavy-duty coated motor & long-life diaphragm
✅ Operating temperature range: 4–60°C

Why Upgrade to Versijet?

The Versijet Series is Flojet’s new generation of industrial pumps, delivering:

• ✅ Direct-fit replacement for 4000 Series models (same footprint & ports)

• ✅ Higher efficiency and smoother operation

• ✅ Stronger construction for extended service life

• ✅ Quieter performance compared to legacy models

Order Now

Replace your discontinued Flojet 4000 Series R4300-504A with the new Flojet Versijet Q451F-168S-2P.