Tru-Flate 17-373 1/4" Female NPT Grip-Tite Air Chuck Instruction Manual

1. Product Overview

The Tru-Flate 17-373 Grip-Tite air chuck is a durable brass lock-on chuck designed for general air filling applications. It features a unique design that allows it to securely attach to a valve stem, functioning similarly to a quick connect coupling. This direct air line (closed) chuck type includes a built-in shutoff valve, making it suitable for direct air line connections but not for use with inflator or pressure gauges.

Key features include:

Direct Air Line (Closed) Design: Equipped with a built-in shutoff valve.
Lock-on Functionality: Stays securely on the valve stem once engaged.
Durable Construction: Made from brass for longevity.
Pressure Rating: Maximum pressure rating of 150 pounds per square inch (psi).
Connection Type: 1/4" Female National Pipe Thread Taper (NPT).

Figure 1: Tru-Flate 17-373 Grip-Tite Air Chuck. This image shows the brass construction and the 1/4" Female NPT connection end.

Tru-Flate Air Chuck with other fittings — Figure 2: Tru-Flate Air Chuck shown with various air tool fittings, highlighting its compatibility and application.

2. Setup Instructions

Before using the Tru-Flate 17-373 Grip-Tite air chuck, ensure proper connection to your air line system.

2.1 Connecting to an Air Hose

Prepare the Air Hose: Ensure your air hose has a compatible male NPT fitting (typically 1/4" NPT) at the end where the chuck will be attached.
Apply Thread Sealant: Apply a suitable thread sealant (e.g., PTFE tape or pipe thread compound) to the male NPT threads of your air hose fitting. This helps create an airtight seal and prevents leaks.
Attach the Chuck: Thread the 1/4" Female NPT end of the Tru-Flate 17-373 air chuck onto the prepared male NPT fitting of your air hose.
Tighten Securely: Hand-tighten the chuck, then use a wrench to tighten it further by approximately 1 to 2 turns past hand-tight. Do not overtighten, as this can damage the threads.
Check for Leaks: Connect the air hose to an air compressor and pressurize the line. Apply a soapy water solution to the connection point. If bubbles appear, tighten the connection slightly or reapply thread sealant.

3. Operating Instructions

The Tru-Flate 17-373 Grip-Tite air chuck is designed for straightforward operation for inflating tires or other items with Schrader valves.

3.1 Attaching to a Valve Stem

Prepare the Valve Stem: Remove the cap from the tire or item's Schrader valve stem.
Engage the Chuck: Push the outer sheath of the Grip-Tite chuck back towards the hose connection.
Connect to Valve: Firmly press the chuck onto the valve stem.
Release Sheath: Release the outer sheath. The chuck will lock onto the valve stem, creating a secure seal. You should hear air flowing into the tire.

3.2 Detaching from a Valve Stem

Push Sheath: Push the outer sheath of the Grip-Tite chuck back towards the hose connection.
Remove Chuck: Pull the chuck straight off the valve stem.
Replace Valve Cap: Replace the valve stem cap to prevent dirt and moisture ingress.

Important Note: This is a direct air line (closed) chuck. It is not designed for use with inflator gauges or pressure gauges. Air will flow only when the chuck is properly engaged with a valve stem.

4. Maintenance

Regular maintenance ensures the longevity and reliable performance of your Tru-Flate 17-373 Grip-Tite air chuck.

Cleaning: Keep the chuck clean and free of dirt, dust, and debris. Wipe it down with a clean cloth after each use.
Inspection: Periodically inspect the chuck for any signs of wear, damage, or corrosion, especially around the sealing surfaces and the locking mechanism.
Lubrication: A small amount of silicone-based lubricant can be applied to the moving parts of the locking mechanism if it becomes stiff. Avoid petroleum-based lubricants as they can degrade rubber seals.
Storage: Store the air chuck in a clean, dry environment when not in use to prevent corrosion and damage.

5. Troubleshooting

If you encounter issues with your Tru-Flate 17-373 Grip-Tite air chuck, refer to the following common problems and solutions:

Problem	Possible Cause	Solution
Air leaks when connected to valve stem.	Chuck not fully engaged. Worn internal seal. Valve stem is too short or damaged.	Ensure the chuck is pushed firmly onto the valve stem and the outer sheath is fully released to lock. Inspect the internal seal for damage. If worn, the chuck may need replacement. For short valve stems, consider using a valve stem extension. Inspect valve stem for damage.
Chuck is difficult to attach or detach.	Lack of lubrication. Dirt or debris in mechanism. Damaged locking mechanism.	Apply a small amount of silicone-based lubricant to the outer sheath and internal mechanism. Clean the chuck thoroughly to remove any obstructions. If the mechanism is damaged, replace the chuck.
Chuck damages valve stem threads.	Improper attachment/detachment technique. Attempting to twist the chuck onto the valve stem.	Always push the chuck straight on and pull straight off. Avoid twisting motions. Ensure the outer sheath is fully engaged/disengaged before connecting/disconnecting. Note: Some users report issues with aluminum valve stems; exercise caution.

6. Specifications

Detailed specifications for the Tru-Flate 17-373 Grip-Tite Air Chuck:

Model Number: 17-373
Brand: Plews (Tru-Flate)
Material: Brass
Color: Gold
Connection Type: 1/4" Female NPT (FNPT)
Thread Size: 0.25 inches
Thread Type: NPT
Maximum Pressure Rating: 150 psi
Item Dimensions (L x W x H): 4.13 x 3.56 x 0.53 inches
Item Weight: 0.8 ounces
Number of Pieces: 1

7. Warranty & Support

Specific warranty information for the Tru-Flate 17-373 Grip-Tite Air Chuck is not provided in this manual. For details regarding warranty coverage, terms, and conditions, please refer to the product packaging or contact the manufacturer directly.

7.1 Customer Support

For technical assistance, product inquiries, or to report issues, please contact Plews customer support. You may also visit the official Plews or Tru-Flate brand store for additional resources and contact information:

Online Store: Visit the Tru-Flate Store on Amazon

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Plews 17-373