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KL FIT12
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COMPLETE MASTER INSTALLATION PLUMBING HARNESSES
Building your own custom train horn configuration or piecing together a heavy-duty pneumatic network à la carte? Skip the guesswork and plumbing run-around with genuine Kleinn Air Fitting Installation Kits. These master hardware assortments are comprehensively bundled to include every necessary structural connection point, manifold junction, and plumbing hardware piece required to wire and plumb your specific onboard air loop from scratch. Engineered to withstand extreme operating pressures, these application-matched packages bring clean, leak-free execution to any custom system build.
PRO-TIER ALL-IN-ONE ASSORTMENTS
Every professional-grade fitting kit is heavily curated with essential electrical and pneumatic baseline items. Each package comes fully loaded with application-specific brass NPT compression adapters, an industrial system automated pressure switch, a dashboard-mount horn activation push button, and a precision applicator vial of genuine Kleinn JUICE Premium Thread Sealant to establish permanent high-pressure structural integrity.
THE VERDICT: The most secure foundation for any custom onboard air system. By marrying industrial-grade brass fittings with vital control modules, these comprehensive kits ensure your custom plumbing layout handles continuous heavy high-pressure loads seamlessly.
VARIATION SELECTION GUIDE
Review the listing package options below to select the precise fitting array required for your direct horn kit architecture:
| Fitting Kit Model | Direct Horn System Compatibility Matrix |
|---|---|
| FIT12 | Designed for Kleinn Horn Kits: HK1, HK2, and HK2-1 |
| FIT34 | Designed for Kleinn Horn Kits: HK3, HK3-1, HK4, and HK4-1 |
| FIT56 | Designed for Kleinn Horn Kits: HK5 and HK6 |
| FIT7 | Designed for Kleinn Horn Kit: HK7 |
| FIT89 | Designed for Kleinn Horn Kits: HK8 and HK9 |
| FIT9-SLIMLINE | Designed for Kleinn Horn Kit: HK9-Slimline |
Each variant kit is configured to contain all the exact structural air line fittings, electrical activation mechanisms, and tank safety hardware required to fully plumb your matching Problaster Horn Kit architecture:
🔴 PRO TIP: Complete your electrical infrastructure seamlessly. Do not forget to pair your new fitting installation array with a dedicated compressor wiring kit. Part #6852 (Standard Wiring Kit) integrates perfectly with any of these fitting variants. If your specific vehicle layout requires an extended structural compressor power line run along the frame rails, upgrade directly to our Part #6858 (Extended Wiring Kit).
INSTALLATION LINKS

$64.95
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.
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.
This warranty does not cover damage or failure resulting from:
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.
To request warranty service, email warranty@kleinn.com with the following information:
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.
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.
Merchandise that has been worn, used, or altered will not be accepted for return or exchange.
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.