• UNx Fluid End 4215HF-Fluid-End UNx-Cutaway

4215 UNx Fluid End - #15 Plungers

Part No: 53110

Convert an existing Jetstream 4200 UNx® Pump to higher flow or operating pressure in just minutes. Flow up to 50.4 gpm (191 l/min) at up to 10,000 psi (700 bar).

The Unx Fluid End is a cost-effective solution to increase the available operating pressure or range of pressures of an existing Jetstream 4200 UNx Pump. These fluid end models deliver all of the benefits that define UNx Fluid Ends as the best in the industry.

  • Superior performance
  • Greater flexibility in the field
  • Reduced downtime and maintenance


Model Name 4215HF
Maximum Power (hp) 325
Maximum Operating Pressure (psi) 10000
Maximum Flow (gpm) 50.4
Minimum Flow (gpm) 14.6
Maximum Power (kW) 242
Maximum Operating Pressure (bar) 700
Maximum Flow (l/min) 191
Minimum Flow (l/min) 185
Plunger Size #15
Plunger Diameter (in) 1.5
Plunger Diameter (mm) 38.1
Number of Plungers 3
Plunger Stroke (in) 4.25
Plunger Stroke (mm) 108
Discharge Port Connection 3/4"NPT Female
Accessory Port Connections 1/2"NPT Female
Number of Accessory Ports 3
Suction Port Connection 2"NPT Female
Minimum Pump Speed (RPM) 150
Maximum Pump Speed (RPM) 514
Flow at 150 RPM (gpm) 14.6
Flow at 200 RPM (gpm) 19.5
Flow at 300 RPM (gpm) 29.3
Flow at 400 RPM (gpm) 39
Flow at 500 RPM (gpm) 48.8
Flow at 514 RPM (gpm) 50.2
Flow per Revolution (gal/rev) 0.0976
Flow at 150 RPM (l/min) 55
Flow at 200 RPM (l/min) 74
Flow at 300 RPM (l/min) 111
Flow at 400 RPM (l/min) 148
Flow at 500 RPM (l/min) 185
Flow at 514 RPM (l/min) 190
Flow per Revolution (l/rev) 0.369
Power End Model 4200

UNx Conversion Video

This video highlights the ease of maintenance and pressure convertibility of Jetstream UNx Pump. (3:59)

15K Bypass Valve - Pump Mount

A bypass valve diverts a portion of pump flow to a low- pressure outlet and is used to prevent bogging of diesel engines when using flows at the low end of the pump’s capability or to adjust pressure on electric motor driven systems.  15,000 psi (1000 bar).  Pump-mounted.

15K Handle-Adjustable Regulator

Maintains constant system pressure when operating one or more shut-in devices. Knob-adjustable. Field-replaceable valve cartridge. For operation at 5,000 - 15,000 psi (350 - 1000 bar). Pump-mounted.

UNx Spare Parts Packages

Packages include all major fluid end replacement packaged together for easy transport and storage.

UNx Plunger Packages

Convert existing 4215, 3615, or 3015 pumps quickly and cost-effectively for jobs that require more flow or pressure than the current pump setup permits.

10K Pressure Gauge (psi) - 1/2"NPT Male Inlet

0 - 20,000 psi scale. 200 psi graduations. Working pressure up to 10,000 psi. 1/2"NPT Male connector.

15K Pressure Gauge (psi) - 1/2"NPT Male Inlet

0 - 30,000 psi scale. 200 psi graduations. Working pressure up to 15,000 psi. 1/2"NPT Male connector.

4200 UNx Bareshaft Pumps

4200 UNx triplex pumps can handle input power up to 325 hp (242 kW). Output from 63 gpm at 8,000 psi (238 l/min at 550 bar) to 11.9 gpm at 40,000 psi (45 l/min at 2750 bar).

4200 UNx Fluid Ends

Increase the range of available operating pressures for any Jetstream 4200 UNx Pump with additional fluid ends. Conversions take only minutes and are available for pressures up to 40,000 psi (2750 bar).