Product Overview

The Flojet 4000 Series Demand Pump – 12V (R4325-143A) was a reliable and widely used diaphragm pump, suitable for liquid transfer, spraying, cooling, and dispensing. It featured a Santoprene diaphragm, EPDM check valves, polypropylene housing, and an integrated demand switch for automatic operation.

⚠️ Please note: As of April 2025, this model is no longer in production. Flojet has now introduced the Versijet 4-Chamber Pump Series, which is designed as a direct replacement with the same footprint and port dimensions for easy installation.

Key Features (4000 Series – R4325-143A)

✅ 2.8 Bar switch setting
✅ 17.0 L/min maximum flow
✅ 12V DC, 6.0 Amps
✅ Santoprene diaphragm & EPDM check valve
✅ Polypropylene pump housing
✅ Self-priming up to 1.5m
✅ Thermal overload protection
✅ Max fluid temperature: 54°C

Recommended Replacement: Flojet Versijet Series 4-Chamber Pump – 12V (Q451F-118S-2P)

Product Overview

The Flojet Versijet Q451F-118S-2P is the modern replacement for the Quad/4000 Series pumps. Built with a 4-chamber diaphragm design, it offers increased pressure capacity, improved flow consistency, and long-lasting durability. With an upgraded 4.1 Bar switch setting and internal bypass, the Versijet is the perfect solution for both new installations and as a direct drop-in replacement for older Flojet 4000 models.

Key Features (Versijet – Q451F-118S-2P)

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

Why Upgrade to Versijet?

The Flojet Versijet Series delivers greater efficiency, quieter operation, and longer service life compared to the older Quad/4000 Series pumps. Designed with the same mounting footprint and port dimensions, installation is quick and hassle-free, making it the perfect replacement for the discontinued R4325-143A model.