Loc-Line 21192 Male NPT Valve for 1/4″ System – Pack of 2

About This Product

The Loc-Line 21192 Male NPT Valve for 1/4″ ID System is a compact, adjustable flow-control valve designed for use with Loc-Line’s 1/4-inch modular hose system. Featuring a 1/4-inch male National Pipe Taper (NPT) threaded connection and a compatible Loc-Line modular connection, this versatile valve allows users to regulate or shut off liquid flow directly at the supply connection.

Manufactured by Lockwood Products, Inc., the Loc-Line 21192 provides a convenient way to connect modular hose assemblies to compatible female NPT-threaded supply lines while maintaining independent control over the flow.

One of the primary advantages of Loc-Line’s modular system is its flexibility. Individual hose segments, fittings, and nozzles can be connected to create adjustable fluid delivery systems tailored to specific applications. The 21192 valve adds flow regulation to these assemblies, allowing users to control the amount of liquid delivered without adjusting the entire supply system.

The valve’s manually operated design allows it to be fully opened, partially opened, or closed, making it useful for applications requiring adjustable delivery rates. Users can reduce the flow for delicate operations, increase it when greater circulation is needed, or shut off an individual line during maintenance.

Constructed from durable acetal plastic, the valve offers excellent resistance to water, corrosion, and a variety of industrial fluids. Its lightweight construction makes it suitable for modular hose assemblies where excessive fitting weight is undesirable.

The distinctive blue-and-orange Loc-Line design makes the valve easy to identify within a modular hose system. Its compact dimensions allow installation in confined spaces where larger conventional valves may be impractical.

Although Loc-Line components are commonly associated with machine-tool coolant delivery, the 21192 valve can also be useful in compatible water-distribution, laboratory, workshop, and custom fluid-handling applications when the operating conditions and materials are appropriate.

For aquarium and pond projects, the valve may be considered for compatible above-water plumbing applications, provided the complete system is evaluated for pressure, chemical compatibility, and suitability around aquatic livestock. The manufacturer does not specifically certify this part for aquarium or potable-water use.

Each package contains two Loc-Line 21192 Male NPT Valves, providing convenient components for dual-line installations, equipment maintenance, or future system expansion.

Whether you’re building a modular coolant delivery assembly, replacing an existing flow-control valve, or designing a custom fluid distribution system, the Loc-Line 21192 offers dependable manual adjustment in a compact, modular format.

Features:

• Adjustable flow-control valve allows users to regulate liquid delivery through compatible 1/4-inch Loc-Line hose assemblies.
• 1/4-inch male NPT connection installs into a compatible female NPT-threaded fitting or supply line.
• 1/4-inch Loc-Line modular connection integrates with the manufacturer’s corresponding modular hose system.
• Pack of two valves provides components for multiple installations or replacement needs.
• Manual shutoff capability allows flow to be stopped at an individual hose connection.
• Partial flow adjustment provides control between fully open and closed positions.
• Durable acetal construction offers resistance to moisture, corrosion, and many compatible industrial fluids.
• Compact valve design is suitable for modular assemblies where installation space is limited.
• Blue-and-orange color scheme matches the standard Loc-Line modular hose system.
• Supports modular hose customization allows users to assemble and modify compatible fluid delivery systems.
• Compatible with female NPT supply connections eliminates the need for a separate male-threaded adapter in suitable installations.
• Suitable for industrial coolant delivery provides localized control at machine-tool fluid connections.
• Useful in custom fluid-handling projects when materials, temperature, and pressure requirements are compatible.
• Serviceable modular connection allows compatible hose assemblies to be disconnected or reconfigured.
• Made in the USA according to published distributor information, subject to manufacturer changes.

Specifications:

Specification	Details
Brand	Loc-Line
Manufacturer	Lockwood Products, Inc.
Product Name	1/4″ Male NPT Valve
Manufacturer Part Number	21192
Manufacturer SKU / UPC	662633211927
Product Type	Manual Flow-Control / Shutoff Valve
Package Quantity	2 Valves
Loc-Line System Size	1/4 inch
Thread Size	1/4 inch
Thread Type	NPT – National Pipe Taper
Thread Gender	Male
Connection Configuration	1/4″ Loc-Line × 1/4″ Male NPT
Valve Operation	Manual Adjustable Flow Control
Valve Positions	Open, Partially Open, Closed
Material	Acetal
Color	Blue and Orange
Maximum Published Flow Rate	250 GPH
Maximum Published Pressure	55 PSI
Maximum Published Temperature	170°F (77°C)
Corrosion Resistant	Yes
Water Resistant	Yes
Primary Application	Modular Fluid and Coolant Flow Control
System Compatibility	Loc-Line 1/4″ Modular Hose System
Country of Origin	USA, Subject to Change

Operating ratings: The 250 GPH flow, 55 PSI pressure, and 170°F temperature limits are published distributor specifications. Actual system performance depends on the supplied pressure, fluid properties, nozzle size, and complete installation.

Package Contents

Component	Quantity
Loc-Line 21192 1/4″ Male NPT Flow-Control Valve	2

Modular hose segments, nozzles, supply fittings, pumps, and additional accessories are sold separately unless specified in the listing.

Key Benefits

Precise Manual Flow Adjustment

The Loc-Line 21192 allows users to adjust the flow through an individual modular hose connection.

This is particularly helpful when a single fluid supply supports several outlets that require different flow rates.

Instead of adjusting the main supply, individual valves can provide localized control.

Convenient Male NPT Connection

The integrated 1/4-inch male NPT thread allows the valve to connect directly to a compatible female-threaded supply fitting.

This simplifies the connection between conventional threaded plumbing and Loc-Line’s adjustable modular hose components.

Modular System Flexibility

Loc-Line hose elements can be assembled into customized arrangements to direct fluid toward specific locations.

The 21192 valve works as a supply-side control component within the compatible 1/4-inch system.

Durable Acetal Construction

Acetal is an engineering plastic known for dimensional stability, mechanical strength, and resistance to many common fluids.

Its corrosion-resistant properties make it useful in compatible applications involving water and industrial coolant.

Chemical resistance should always be checked for the specific fluid and operating conditions.

Convenient Two-Pack

Two valves are included in each package, making this product suitable for installations with multiple outlet lines or for keeping a replacement valve available.

Recommended Applications

Machine-Tool Coolant Systems

Install the valve in compatible coolant delivery lines to regulate fluid flow toward cutting tools, workpieces, and machining areas.

The valve can be used with suitable Loc-Line nozzles and hose segments to direct coolant where needed.

Workshop Fluid Delivery

Create adjustable fluid delivery assemblies for compatible workshop equipment, cleaning stations, and other low-volume liquid distribution applications.

Custom Water-Distribution Systems

Use the valve in appropriately designed systems requiring a connection between a female 1/4-inch NPT fitting and a Loc-Line modular hose.

Laboratory and Equipment Applications

Provide manually adjustable fluid delivery in compatible equipment where the valve’s material and pressure specifications satisfy the application requirements.

Aquarium and Pond Equipment Projects

The valve may be useful in certain custom external water-routing assemblies, subject to verification of material suitability and operating conditions.

It should not be described as aquarium-certified, potable-water-certified, or intended for submerged use without additional manufacturer confirmation.

Installation and Usage Instructions

1. Confirm Compatibility

Verify that the supply connection has a compatible 1/4-inch female NPT thread.

Confirm that the modular hose uses the Loc-Line 1/4-inch system.

NPT fittings should not be confused with BSP or other thread standards.

2. Shut Off the Fluid Supply

Turn off the pump or supply source and relieve system pressure before beginning installation.

Never disconnect a pressurized fluid line.

3. Inspect the Valve

Check the male threads, modular connection, and adjustment mechanism for visible damage.

Ensure the valve operates smoothly before installation.

4. Install the Threaded Connection

Connect the male NPT end to the compatible female-threaded fitting.

Follow the equipment manufacturer’s instructions for suitable thread sealant and tightening procedures.

Avoid excessive tightening, which can damage plastic threads.

5. Connect the Modular Hose

Attach the compatible Loc-Line 1/4-inch hose assembly to the valve’s modular connection.

Ensure the connection is securely seated.

Position the hose and nozzle for the intended fluid delivery application.

6. Restore Flow Gradually

Slowly restore fluid flow and inspect the threaded connection for leaks.

Operate the valve to confirm that flow can be adjusted and shut off.

7. Adjust the Desired Flow

Open or partially close the valve to achieve the required delivery rate.

Monitor system pressure and ensure operation remains within the published limits.

Maintenance and Care Recommendations

Inspect the valves periodically for leaks, cracks, damaged threads, and excessive wear.

Keep modular connections free from dirt, debris, and accumulated deposits.

Operate the valve periodically to help identify stiffness or irregular movement.

Avoid forcing the valve handle beyond its intended range.

Clean the exterior using methods appropriate for acetal plastic.

Do not use aggressive solvents without confirming chemical compatibility.

When servicing the valve, stop the supply and relieve pressure first.

Replace damaged valves rather than attempting repairs that could compromise the connection.

Important Product Information

Loc-Line 21192 is a 1/4-inch Male NPT Valve supplied in a package of two.

The valve combines a male NPT threaded connection with a Loc-Line 1/4-inch modular hose connection.

It is intended to provide manual flow adjustment and shutoff for suitable fluid distribution systems.

This is not a check valve. It does not automatically prevent reverse flow. For that purpose, Loc-Line offers a separate in-line check valve, part number 21191.

The valve is also distinct from the 1/4-inch female NPT valve, part number 21193, and the in-line valve, part number 21194.

The manufacturer’s product information does not establish an aquarium-specific or potable-water certification. Verify suitability before using the product in life-support systems or applications where water contacts aquatic animals.

Recommended application: A durable, manually adjustable Loc-Line flow-control valve designed for the 1/4-inch modular hose system. Featuring a 1/4-inch male NPT threaded connection, acetal construction, and a convenient two-pack configuration, the Loc-Line 21192 is ideal for compatible coolant systems, workshop fluid delivery, and custom modular water-routing applications.