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Description
Green HNBR #8 A/C Fitting O-Rings are highly specialized, premium sealing components engineered specifically for automotive and heavy-duty transport climate control systems. In mobile air conditioning layouts, #8 fittings are typically found on the discharge lines carrying high-pressure, superheated gas from the compressor outlet over to the condenser core.
The Science Behind Green HNBR
Unlike standard black nitrile or neoprene hardware store O-rings used for standard water or oil plumbing, these green O-rings are formulated from Hydrogenated Nitrile Butadiene Rubber (HNBR). This targeted compound engineering is vital for automotive setups:
Refrigerant Chemical Shield: HNBR remains completely stable when exposed to modern R134a and R1234yf refrigerants, as well as the specialized synthetic PAG and POE oils needed to keep your compressor lubricated. Standard rubber will swell, rapidly degrade, and cause a major system drop in pressure.
Thermal Endurance: These seals safely manage continuous operational temperature extremes shifting from -40°F (-40°C) up to 257°F (125°C) under heavy engine-bay heat without cracking, flattening, or losing structural elasticity.
Sizing and Physical Geometry
Depending on whether your A/C hard-lines use standard compression inserts, insert block-style ends, or special manufacturer fittings (like a classic Ford Springlock), a standard #8 hose fitting O-ring generally aligns with these dimension bands:
Inner Diameter (I.D.): Approx. 0.424" to 0.489" (10.7mm to 12.4mm)
Cross-Section Thickness (C.S.): Approx. 0.070" to 0.076" (1.76mm to 1.93mm)
Pro-Tips for a Leak-Free Installation
Never Install Dry: Always coat the new green O-ring with a few drops of clean, system-compatible A/C compressor lubricant (like fresh PAG oil) before seating it. This lets the components slide together cleanly, avoiding dangerous scuffs, tears, or twisting during assembly.
One-Time Compression: Air conditioning O-rings take a permanent compression set to tightly seal high-pressure fluid paths. Never reuse a crushed old seal during regular line maintenance; always drop a brand-new one into the seat.
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Refund Policy
We offer a 30-day return policy, which means you have 30 days from the date you receive your item to request a return.
Eligibility for Returns
To be eligible for a return, your item must be:
In the same condition as received
Unworn or unused
With original tags attached
In its original packaging
You must also provide a receipt or proof of purchase.
How to Start a Return
To initiate a return, please contact us at jonathon@hotrodhardware.com. Once your return request is approved, you will be provided with the return address and, if applicable, an RMA (Return Merchandise Authorization) number.
Important: Items sent back without prior authorization will not be accepted.
If you have any questions regarding your return, feel free to contact us at the email above.
Damages and Issues
Please inspect your order upon delivery. If your item is defective, damaged, or if you received the wrong item, contact us immediately so we can evaluate the issue and resolve it promptly.
Exceptions / Non-Returnable Items
The following items are not eligible for return:
Custom or personalized products (including special orders)
Hazardous materials, flammable liquids, or gases
Sale items
Gift cards
If you are unsure whether your item qualifies, please contact us before initiating a return.
Exchanges
The fastest way to receive a replacement item is to return your original item (once approved) and place a new order separately.
Free Shipping Orders
Orders that qualified for free shipping are subject to deduction of the original outbound shipping cost if the item is returned.
Refunds
Once your return is received and inspected, we will notify you regarding the approval status of your refund.
If approved:
Refunds will be issued to your original payment method
Any applicable restocking fees will be deducted
Original shipping charges (if applicable) will be deducted
Return shipping costs (if arranged by Hot Rod Hardware) will be deducted
Please note:
Payment processing fees (including PayPal, Amazon Pay, or other merchant fees) are non-refundable
It may take additional time for your bank or credit card provider to process and post the refund
