Flow Restrictor Series

B-Series Build-In Flow Restrictors

MB1380, MB1400, MB1500, MB1600 and MB1640 install inside water-heater inlet pipes, hand-shower connectors, overhead showers and pipework to restrict inlet flow. Select by installation position and bore dimensions.

Models, Specifications and Technical Documents

MB1380

Primarily for the water inlet pipes of gas water heaters and wall-hung boilers. Also used inside hand-shower tail connectors, overhead showers and pipework for inlet flow control.

Model MB1380
Product Name Build-in flow restrictor (B series)
Size / O.D. O.D. 13.8mm
Flow Rate 2-12L/min
Function Flow restrictor / Water saving
Test Pressure 60 PSI or 3 bar
Operating Temperature 0–55°C
Materials POM / Silicone
Package OEM

01 / Gas Water-Heater Cold-Water Inlet

MB1380 installs inside a compatible gas water-heater cold-water inlet to restrict incoming flow. The enlarged view shows the insert seated inside the connection. Hot-water temperature performance depends on the appliance, supply pressure and operating conditions.

MB1380 — Gas Water-Heater Cold-Water Inlet View full installation diagram

02 / Other Installation Positions

MB1380 can also serve compatible overhead-shower inlets, hand-shower connections and pipe fittings. Confirm the internal bore, seating depth and retention structure at each position.

MB1380 — Other Installation Positions View full installation diagram

Installation and Sourcing Notes

Confirm the outside diameter against the actual cavity or bore dimension. The outside diameter does not directly equal the pipe size.

Check the installation thickness, retention structure, and sealing arrangement before placing an order.

Provide cavity dimensions, target flow and pressure, expected quantity, and destination market for accurate model selection and sample review.

Common Questions

Can I select a model by matching the outside diameter to the pipe size?

No. The outside diameter does not equal the pipe size. Check the actual cavity dimensions, thickness, and retention structure.

What information should I provide for sourcing?

Provide cavity dimensions, target flow and pressure, expected quantity, and destination market. We will review model options and sample requirements.

Which water path is an insert-type restrictor intended for?

Confirm the installation position for the model and project. Water-heater applications concern the water inlet, not the gas supply line.

Does an insert-type structure guarantee constant temperature or flow?

The structure name does not establish either guarantee. Review the configuration, pressure conditions and complete system test results.

What cavity details should be checked before installation?

Check cavity dimensions, sealing and retention, flow direction and installation depth. Provide drawings or a sample.

MB1380

Discuss Your Insert-Type Flow Restrictor Configuration

Share the application details, target flow and pressure, expected quantity, and destination market. We will help review models, samples, and documentation requirements.