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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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 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?

One-Year Limited Defect Warranty for Kleinn Automotive Accessories:

Kleinn Automotive Accessories is committed to delivering high-quality products to our customers. We stand behind the craftsmanship and materials of our products by offering a comprehensive one-year limited warranty. This warranty is extended to the original purchaser, ensuring that when our products are installed properly and used under standard conditions, they will be free from defects in workmanship and materials for a period of one year from the original date of purchase.

This warranty encompasses a promise that the product you have purchased will perform as expected under normal use conditions and will not suffer from flaws in materials or craftsmanship. However, it is important to note that this warranty does not cover any damage that results from abusive use, operation that is not in line with the product’s intended purpose, or harm resulting from exposure to harsh environmental conditions. In the event that a product is found to be defective within the warranty period following a thorough inspection, Kleinn Automotive Accessories reserves the right to either repair or replace the defective item at no additional charge to the purchaser. It is our goal to ensure that our products meet the high standards that our customers expect, but we also want to clarify that Kleinn is not responsible for covering any costs related to the installation of our products, nor are we liable for any loss or damage that may occur as a result of the repair or replacement process of any product under warranty.

Extended Two-Year Warranty for Select Products:

Understanding the specific needs of our customers and the demands placed on certain products, Kleinn Automotive Accessories is pleased to offer an exclusive extended two-year warranty for our 6450/6650 Compressors and 730 Horns. This special warranty extension reflects our confidence in these products’ durability and performance. Eligible products under this extended warranty will enjoy all the benefits of our standard one-year warranty with an additional year of protection, totaling two years from the date of purchase. This extended warranty coverage ensures that these specific models, recognized for their robustness and reliability, receive the extra assurance customers desire for these critical components.

Detailed Warranty Return Procedure:

Should you need to initiate a return under the warranty, we have a straightforward process designed to make it as convenient as possible for our valued customers. To start, you will need to email a copy of your sales receipt, which must be dated within the past year for standard warranty claims or within the past two years for claims under the extended warranty for the 6450 Compressors and 730 Horns. This email should be directed to our Warranty Manager and include your full name, email address, telephone number, and a concise description of the problem you are experiencing.

Upon receipt of your email, a dedicated representative from Kleinn Automotive Accessories will reach out to you directly. Our first step will always be to attempt to resolve the issue through technical support, aiming to provide a quick and effective solution. If the problem cannot be addressed remotely, our representative will issue a Return Authorization number. This number is crucial as it will identify your return throughout the inspection process. You are then required to send the product back to Kleinn Automotive Accessories for a comprehensive physical inspection.

Upon inspection, if the product is determined to be defective due to issues in workmanship or materials, Kleinn will undertake to either repair or replace the product at our discretion. We are committed to ensuring that our customers receive products that meet our high-quality standards, and we will make every effort to resolve warranty claims to your satisfaction. However, if the inspection reveals that the product does not have a material defect, we will return the unit to the customer. In such cases, the shipping costs for the return will be the responsibility of the customer.

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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