Dilution Solutions Flow Restrictor, 3/4 in 14 GPM (D14 Series)

The Dilution Solutions Flow Restrictor (FR34-14GPM) is a 3/4-inch inline fitting rated at 14 GPM, designed to limit the volume of water flowing through an irrigation or fertigation line. It is part of the D14 series and is recommended for installation on the inlet side of a Dosatron proportional doser any time there is a risk of overflowing the unit due to supply pressure or flow that exceeds the doser’s rated inlet capacity.

Flow Restrictor Specifications

The following specifications are derived from the canonical product listing and manufacturer part numbering for the FR34-14GPM.

Specification	Value
Brand	Dilution Solutions (Dosatron)
Model Number	FR34-14GPM
Series	D14
Connection Size	3/4 inch
Flow Rate	14 GPM (maximum)
SKU	DSFR3414GPM
GTIN-12	714360012541
Available Alternate Rate	10 GPM (FR34-10GPM)

Why Choose the Dilution Solutions Flow Restrictor (D14 Series)

Flow restrictors are a small but consequential component in any Dosatron-based dosing system. Without one, a supply line delivering more than the doser’s rated inlet flow can cause the unit to overflow — allowing undiluted concentrate to bypass the injection mechanism and enter the distribution line. The FR34-14GPM prevents this by capping inlet flow at 14 GPM.

• Overflow protection for Dosatron units: The manufacturer explicitly recommends a flow restrictor on the inlet side of any Dosatron unit where supply pressure or flow may exceed the unit’s inlet capacity. The FR34-14GPM is engineered for this application.
• 3/4-inch connection — the standard for D14-series hardware: The 3/4-inch thread size matches the standard inlet connection on Dosatron D14-series proportional dosers, making this a direct-fit accessory rather than an adapter-dependent workaround.
• 14 GPM ceiling covers most greenhouse and commercial grow room supply lines: The 14 GPM rating handles typical supply flow rates found in commercial irrigation setups while still providing meaningful restriction protection for the doser.
• Simple drop-in installation: As an inline fitting, the flow restrictor installs directly into the water supply line ahead of the doser without requiring tools beyond basic pipe wrenches or hand-tightening, depending on the connection type.
• Available in two flow rates: If your supply flow is lower, the 10 GPM version (FR34-10GPM) is also available. Choose 14 GPM when your supply pressure or pipe size can deliver more than 10 GPM under typical operating conditions.

Best Uses for the Dilution Solutions Flow Restrictor

This fitting is purpose-built for a specific role in Dosatron-based fertigation and chemical dosing systems. It is not a general-purpose flow control valve — it is a fixed-rate restrictor designed to protect a downstream doser from inlet overflow conditions. The following scenarios describe where this product is most applicable.

• Dosatron D14-series inlet protection: The primary and intended use case. Install in-line on the water supply immediately before the Dosatron unit to cap incoming flow at 14 GPM and eliminate overflow risk.
• Greenhouses with variable municipal or well-water pressure: Supply pressure in greenhouses can fluctuate, especially if multiple zones run simultaneously or if a pump cycles irregularly. The restrictor provides a fixed ceiling on volume delivered to the doser regardless of upstream variation.
• Commercial grow rooms running automated nutrient dosing: When a fertigation controller feeds multiple benches or zones, total line flow can exceed what a single Dosatron unit can handle. A restrictor at the doser inlet isolates the doser from the full line capacity.
• Retrofit installs where original restrictor was lost or damaged: Dosatron systems are often sold as bundles and may ship with a restrictor. If the original part is missing or fails, the FR34-14GPM is the correct replacement for D14-series units with 3/4-inch inlets.
• New system builds requiring Dosatron accessories: When specifying a complete Dosatron-based nutrient dosing line — including the doser, strainer, and backflow prevention — the flow restrictor is a standard component in the recommended inlet assembly. If you are building out a nutrient delivery system, consider pairing this with compatible dosing and pH management supplies such as pH-balanced nutrient concentrates that work alongside your Dosatron doser.

Compatibility

The FR34-14GPM is designed for use with Dosatron D14-series proportional dosers. The D14 series covers Dosatron units rated for up to 14 GPM throughput with a 3/4-inch inlet connection. Because Dilution Solutions is Dosatron’s North American brand, this part is interchangeable with equivalent Dosatron-branded flow restrictors for the same series.

Connection type: 3/4-inch — verify that your supply line and Dosatron inlet are also 3/4 inch before ordering. If you are running a different line size, reducers or adapters will be required and are not included with this part.

Flow rate selection: Choose the 14 GPM model (this product) when your supply line is capable of delivering more than 10 GPM. If your supply is lower-volume, the FR34-10GPM (10 GPM) variant may be more appropriate. Both are available and use the same 3/4-inch connection.

Not a pressure regulator: This part controls volumetric flow rate, not pressure. If your system requires pressure regulation upstream of the doser (typically to keep inlet pressure within the manufacturer’s specified range), a separate pressure regulator should be installed in addition to the flow restrictor.

If you are setting up a grow environment that incorporates your Dosatron dosing system alongside a structured growing space, see related options like the 48x48x78 grow tent for an enclosure that supports organized irrigation and nutrient delivery infrastructure.

Sources & Further Reading