Model 53814N: Straight Hex Coupler | 3/8" Male NPT to 1/4" Male NPT

  • Hex male nipple - 3/8" M NPT to 1/4" M NPT - Kleinn Automotive Accessories - KL 53814N

KL 53814N

$6.49
$6.49 $6.49

💳 Get it today, pay over time with Shop Pay Installments.

In stock
PROP 65 WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

MODEL 53814N: STRAIGHT HEX COUPLER | 3/8" MALE NPT TO 1/4" MALE NPT

HIGH-QUALITY HEAVY-DUTY PNEUMATIC COMPONENT INTEGRATION

Bridge your different pneumatic component thread sizes seamlessly with the premium Kleinn Model 53814N Straight Hex Coupler. Explicitly engineered to link a 3/8" Female NPT port directly to a standard 1/4" Female NPT port, this commercial-grade hex reducer nipple creates a solid, high-flow bridge that eliminates unneeded spacing extensions. It serves as a vital hardware component for custom upfitter layouts, coupling mismatched storage tank ports, matching manifold arrays, or plumbing heavy-duty train horn solenoids.

PRECISION-MACHINED HEX CENTER ARCHITECTURE

The Model 53814N features an integrated, heavy-walled hex nut center section designed for effortless installation using standard service tools. This convenient layout gives you a solid grip surface for standard wrenches, ensuring you can apply proper seating torque without scoring or distorting the outer threads. Precision-machined from premium solid brass for superior structural durability, the deep, clean NPT thread profiles create an airtight mechanical bond built to withstand continuous vibration and extreme high-pressure demands.

Why Choose the 53814N Hex Coupler Adapter?

  • Asymmetrical Dual Male Threads: 3/8" Male NPT to 1/4" Male NPT configuration delivers clean, direct size adaptation between standard and high-capacity air accessories.
  • Rugged Center Hex Nut: Integrated hex collar provides a robust wrench flats surface for controlled tightening, adjustments, or quick system removal.
  • Precision-Machined Threading: Exceptionally clean, sharp thread cut ensures deep, leak-proof component pairing that actively resists loosening.
  • High-Pressure Durability: Heavy-duty brass construction stands up to continuous automotive chassis vibration and structural pressure loads.

THE VERDICT: The definitive component-to-component threaded reducer adapter. The Model 53814N marries rugged structural wall thickness with flawless thread cuts to ensure your mismatched air tanks, compressors, and upfitter blocks remain perfectly joined and completely airtight.

What's Included in the Box

  • Hex Male Nipple: One (1) Model 53814N Straight 3/8" Male NPT to 1/4" Male NPT Hex Coupler Adapter.

🔴 PRO TIP: Lock out hidden pneumatic pressure drops and phantom leaks. When threading this male hex adapter into your tank or manifold ports, avoid over-torqueing to protect the brass receiver walls from stress fractures. Always apply a few drops of liquid anaerobic thread sealant compound like our genuine Kleinn JUICE across both male thread leads to form a permanent, vibration-resistant structural seal.

PRODUCT SPECIFICATIONS

Feature Details
Part Number 53814N
Fitting Interface Type Straight Hex Male Nipple / Sizing Adapter Nipple
Thread Sizing (Side A) 3/8" Male NPT (National Pipe Thread)
Thread Sizing (Side B) 1/4" Male NPT (National Pipe Thread)
Material Composition Precision Industrial-Grade Solid Brass Construction
Primary Utility Application Direct coupling of different sized female pneumatic accessories, manifolds, tanks, and solenoids
Component Weight 0.1 lbs
Model 53814N: Straight Hex Coupler | 3/8" Male NPT to 1/4" Male NPT

$6.49

Does it come with a warranty?

Kleinn Automotive Accessories Limited Warranty

Kleinn Automotive Accessories stands behind the quality and craftsmanship of our products. Our products are covered against defects in materials and workmanship when properly installed and used under normal operating conditions, subject to the terms below.

One-Year Limited Warranty

Unless otherwise specified, Kleinn Automotive Accessories products are covered by a 1-year limited warranty from the original date of purchase.

This warranty applies to the original purchaser and covers defects in materials and workmanship under normal use.

If a product is determined to have a covered warranty defect, Kleinn Automotive Accessories will, at its discretion, repair or replace the defective product or component.

What Is Not Covered

This warranty does not cover damage or failure resulting from:

  • Improper installation
  • Misuse, abuse, or improper operation
  • Use outside the product's intended application or specifications
  • Modification or alteration of the product
  • Accidents or physical damage
  • Electrical damage
  • Environmental damage or exposure
  • Normal wear and tear

Kleinn Automotive Accessories is not responsible for installation or removal charges, diagnostic fees, labor costs, vehicle downtime, loss of use, or other incidental or consequential expenses associated with warranty service.

Warranty Claims

To request warranty service, email warranty@kleinn.com with the following information:

  • A copy of your original sales receipt or proof of purchase
  • Your full name
  • Email address
  • Telephone number
  • A brief description of the issue

A Kleinn representative will review your claim and may first attempt to resolve the issue through technical support.

If the product needs to be returned for inspection, Kleinn will provide a Return Authorization (RA) number and return instructions. Products should not be returned without prior authorization.

Once received, the product will be inspected to determine whether the issue is covered under warranty. If a covered defect in materials or workmanship is confirmed, Kleinn will, at its discretion, repair or replace the defective product or component.

If inspection determines that the product does not have a covered warranty defect, the product may be returned to the customer, and the customer will be responsible for applicable return shipping costs.

This limited warranty gives you specific legal rights. You may also have other rights, which vary from state to state.

Kleinn Automotive Accessories
4045 N. Highway Drive, Tucson, AZ 85705
Tel (520) 579-1531

What's the returns policy?

How To Return An Item

Your item must be in its original unused condition to be returned, unless there is a manufacturer defect. You must return the item within 30 days of your purchase.

1. Please email support@kleinn.com to request a refund and we will assign you a Return Authorization #.

2. Mail your returned item to:
Kleinn Automotive Accessories
Returns Department
4045 N Highway Drive
Tucson, AZ 85705

3. Include in your package a signed letter stating the reason for your return and the original receipt.

Return Non-Exceptions

Merchandise that has been worn, used, or altered will not be accepted for return or exchange.

Restocking Fee

All returns are subject to a 15% restocking fee, which will be deducted from your refund. If shipping and handling fees were applied to your order, they are non-refundable.

Customer Reviews

4.87 ★ (337)
Verified