There is only one lower 0-ring. There is an upper one with the check valve. Typically the lower one needs replaced if the coupler is leaking.

What size in millimetres is the lower o ring for the Harley check valve?

As someone who has tried to replace the o-rings both with and without this tool, i will recommend whenever possible to just replace the whole assembly, hose and all with the oem part. save yourself the hassle.

where is the product made? thanks.

The tag and card inside have no info. Maybe if you go to fueltool.com you can find the answer.

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Fuel Tool EFI Check Valve Lower O-Ring - MC200-5

Product ID: 33375220

Details

Brand
Fuel-Tool
Color
black
Material
Viton
Temperature Range
-4E+1 °C
UPC
857266003012

🔥Fits wide range of Harley Davidson EFI models

♻️Cost-saving O-ring replacement vs full valve swap

🛠️Viton material for superior chemical resistance

MX$995

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Seal your ride with confidence — don’t let leaks slow your legacy!

VALUE 5 PACK - Includes 5 O-rings so you’re always ready for maintenance without extra orders
DIY FRIENDLY UPGRADE - Simple installation saves you costly mechanic visits and downtime
PRECISION VITON SEAL - Engineered with DuPont Viton for unmatched fuel and heat resistance
UNIVERSAL HARLEY FIT - Compatible with 20+ Harley Davidson EFI models from 2001-2020
LEAK PROOF PERFORMANCE - Eliminates fuel leaks, ensuring a dry, safe ride every time

The Fuel Tool EFI Check Valve Lower O-Ring MC200-5 is a premium DuPont Viton O-ring designed specifically for Harley Davidson fuel-injected models (2001-2020). It offers superior chemical and temperature resistance, preventing fuel leaks and extending the life of your fuel system. This cost-effective replacement part fits a broad range of Harley models, enabling easy DIY installation and saving you from expensive valve or fuel line replacements. Packaged in a convenient 5-pack, it ensures you’re always prepared for routine maintenance.

Specifications

ASIN	B009RIUSOY
Best Sellers Rank	#244,462 in Automotive ( See Top 100 in Automotive ) #42 in Automotive Replacement Fuel Injection O-Rings & Kits
Brand Name	Fuel-Tool
Color	black
Customer Reviews	4.5 4.5 out of 5 stars (346)
Included Components	Fuel Tool MC200-5
Item Type Name	O-Rings & Kits
Item Weight	4.54 g
Manufacturer	Fuel-Tool
Material Type	Viton
Model	MC200-5
Number of Items	1
Number of Pieces	1
Part Number	MC200-5
Set Name	5-Pack
Temperature Range	-4E+1 °C
UPC	857266003012
Unit Count	1 Count
Warranty Description	Manufacturer

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