Model 51218: Straight Compression Fitting for 1/2" Outer Diameter Airline | 1/8" Male NPT

KL 51218

$8.69
$8.69 $8.69

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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 51218: 1/8" MALE NPT STRAIGHT COMPRESSION FITTING FOR 1/2" O.D. TUBE

SPECIALIZED THREAD REDUCTION & HIGH-VOLUME LINE ADAPTATION

Bridge custom high-volume plumbing paths straight into compact accessory housings with the premium Kleinn Model 51218 Straight Compression Fitting. Precision-engineered to handle complex large-to-small pneumatic layout transitions without the need for multiple stacked reducers, this commercial-grade adapter connects a high-capacity 1/2" O.D. air supply line directly to components featuring smaller 1/8" NPT ports. It serves as an essential hardware link for integrating specialized accessories—such as compact electric solenoids, specific pressure monitoring switches, or performance dashboard gauges—into your vehicle's core air line infrastructure.

AIRTIGHT MECHANICAL COMPRESSION SECUREMENT

The Model 51218 features a slim, inline profile that optimizes space-efficiency where every fraction of an inch counts under the dash or along packed chassis frame rails. Outfitted with precision-cut 1/8" Male NPT threads on one side, the opposite end features a heavy-duty mechanical compression assembly that tightly seats standard 1/2" Outside Diameter (O.D.) high-pressure tubing. Its matching locking nut and ferrule system establish a permanent mechanical grip built to handle high PSI levels and resist continuous automotive road vibrations.

Why Choose the 51218 High-Flow Compression Adapter?

  • Specialized Thread Transition: Direct connection between high-volume 1/2" O.D. tubing and smaller 1/8" NPT ports without stacking bulky reducer bushings or step-down adapters.
  • Airtight Compression Seal: Pre-matched nut and compression sleeve ferrule create a high-pressure, metal-to-metal bond on the tubing without needing specialized flaring or soldering.
  • Slim Straight Inline Profile: Low-profile engineering maximizes workspace clearances, making it perfect for clean plumbing in tight dashboard clusters or crowded manifold setups.
  • Industrial Strength Build: Precision-machined for thread accuracy, structural wall durability, and long-term resistance to corrosion and high-pressure fatigue.

THE VERDICT: The definitive straight inline fitting for custom accessory adaptation. The Model 51218 merges a rugged mechanical compression sleeve with a space-saving 1/8" NPT footprint to guarantee your high-capacity air lines interface flawlessly with specialized solenoids, switches, and gauges.

What's Included in the Box

  • Compression Fitting: One (1) Model 51218 Straight 1/8" Male NPT to 1/2" O.D. Tube adapter body.
  • Locking Hardware: One (1) pre-matched 1/2" compression nut and inner ferrule locking sleeve kit.

🔴 PRO TIP: Ensure a permanent, zero-leak lock on your accessory lines. Before snugging down the compression nut with your standard tools, use a sharp, dedicated hose cutter to slice your thick-walled 1/2" O.D. high-pressure line completely square and smooth. Always add a few drops of liquid anaerobic compound like our genuine Kleinn JUICE to the small 1/8" Male NPT threads to completely insulate against slow, phantom pressure leaks.

PRODUCT SPECIFICATIONS

Feature Details
Part Number KL 51218 (51218)
Fitting Type Straight Inline Mechanical Reduction Compression
Thread Connection Size 1/8" Male NPT (National Pipe Thread)
Compatible Tube Sizing 1/2" O.D. (Outer Diameter) High-Pressure Tubing
Installation Hardware Integrated Compression Ferrule Sleeve & Threaded Locking Nut 
Primary Utility Application Adapting high-volume 1/2" O.D. air lines to smaller 1/8" NPT ports on gauges, switches, and solenoids
Component Weight 0.05 lbs
Model 51218: Straight Compression Fitting for 1/2" Outer Diameter Airline | 1/8" Male NPT

$8.69

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.

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