Flojet 4000 Series 12V Demand Pump – R4300-504A (Replaced by Q451F-168S-2P)

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 and 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 and 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 and 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 and ports)

• Higher efficiency and smoother operation

• Stronger construction for extended service life

• Quieter performance compared to legacy models

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