SIFTON 35-0581 Flow Petcock Straight Down Outlet Fx 3/8

( Brand: Sifton ), ( Manufacturer Part Number: 35-0581 ), ( Material: Chrome-plated Bras, Chrome-plated Brass ), ( Vintage Part: No ), ( Fuel Type: Petrol ), ( Type: Petcock ), ( Unit Type: Unit ), ( Oe/oem Part Number: 62125-55b ), ( Positions: Off, On, Reserve ), ( Outlet Type: Single ), ( Country/region Of Manufacture: Taiwan ), ( Performance Part: Yes )

Review SIFTON Hi flow 3/8 Inch Petcock Straight Down Outlet Harley Fx Xl fits FL 1955–1974

Introducing the Sifton 35-0581 Hi-Flow 3/8 Petcock with Straight Down Outlet, specifically designed for Harley-Davidson FX, FL, and XL models manufactured between 1955 and 1974. This high-performance petcock is an essential upgrade for riders seeking improved fuel system efficiency and easier servicing.

Crafted from premium materials, this petcock boasts a robust, durable construction. The body is engineered from brass, a material known for its resistance to corrosion and durability. The internal components, including the diaphragm and valve, are made from stainless steel, ensuring long-lasting performance even in the harshest conditions.

The Sifton 35-0581 Hi-Flow Petcock features a 3/8 NPT threaded outlet that provides a larger fuel flow rate compared to the original equipment. This upgrade results in a more responsive fuel delivery system, enhancing the overall riding experience. The straight-down outlet design simplifies fuel line installation and eliminates the need for complicated bends, making it an attractive choice for custom builds and restorations.

One of the key benefits of this petcock is its easy-to-use design. The integrated float bowl drain makes fuel system servicing a breeze. Simply unscrew the drain plug, and you'll have access to the float bowl for cleaning or adjustments. Additionally, the petcock comes with an adjustable float, allowing you to fine-tune the fuel level for optimal performance.

The Sifton 35-0581 Hi-Flow Petcock with Straight Down Outlet is a direct replacement for the original equipment on Harley-Davidson FX, FL, and XL motorcycles from 1955 to 1974. Installation is straightforward, requiring only basic hand tools and minimal mechanical knowledge. Upgrade your motorcycle's fuel system with this high-quality, reliable, and easy-to-use petcock.

The Sifton 35-0581 Hi-Flow 3/8 petcock straight down outlet is a popular aftermarket replacement for the stock petcock on Harley-Davidson FX, FL, and XL models from 1955 to 1974. Here are some pros and cons of using this petcock:

1. Improved Flow Rate: The Hi-Flow petcock allows for a faster fuel flow rate compared to the stock petcock, which can help improve engine performance and response.

2. Easy Installation: The petcock is relatively easy to install, and it does not require any modification to the fuel system or the tank.

3. Durable: The Sifton petcock is made of high-quality materials and is designed to last longer than the stock petcock.

4. Adjustable: The petcock has an adjustable fuel level gauge, which allows riders to easily monitor their fuel level.

5. Improved Appearance: The straight down outlet of the petcock gives the fuel tank a clean and modern look.

1. Cost: The Sifton petcock is more expensive than the stock petcock, which may be a deterrent for some riders.

2. Fuel Splash: Some riders have reported fuel splash during aggressive riding or cornering due to the straight down outlet.

3. Potential Leaks: Like any fuel system component, there is a risk of leaks with the Sifton petcock. Proper installation and regular maintenance are essential to prevent leaks.

The Sifton 35-0581 Hi-Flow 3/8 petcock is an excellent aftermarket upgrade for Harley-Davidson FX, FL, and XL models from 1955 to 1974. It offers improved fuel flow rate, easy installation, durability, adjustability, and a modern appearance. However, it comes with a higher cost, potential fuel splash, and a risk of leaks. If the benefits outweigh the drawbacks for you, then the Sifton petcock is a worthy investment.

If you are looking for a high-performance fuel system upgrade for your Harley-Davidson from the 1955-1974 era, the Sifton 35-0581 Hi-Flow 3/8 petcock is an excellent choice. Ensure that you install it correctly and maintain it regularly to enjoy its benefits without any issues.

Details:

Works with pre-1975 Harley model's FL, FX, XL 3/8 NPT Petcock Bungs and most custom tanks a Bung. If the Lever is in OFF position and pointed at you, ON to left R Reserve your right. If your Petcock is on the RIGHT SIDE of tank. Petcocks are then Chrome Plated to look good for years come Also available in Polished Brass.

The built-in filter allows for extra protection against debris entering your fuel system while still providing maximum Flow. Available with Three Different Fuel Outlet's LEFT 90 - RIGHT STRAIGHT DOWNWARD. If your Petcock is on the LEFT SIDE of tank. Male 3/8 NPT thread.

For use with Pre-1975 Harley FL, FX, XL model's 3/8 NPT Petcock Bungs. Straight or Downward means that the Fuel Outlet is facing DOWN towards ground. R Reserve, ON and OFF just like OEM.

part #: 350581 prices

• $85.98-$105.95

specifications fuelegress:

• for models: Fl
• for makes: Harley
• for years: 1955-1974
• brand: Sifton
• manufacturer part number: 35-0581
• material: Chrome-plated Bras, Chrome-plated Brass
• vintage part: No
• fuel type: Petrol
• type: Petcock
• unit type: Unit
• oe/oem part number: 62125-55b
• positions: Off, On, Reserve
• outlet type: Single
• country/region of manufacture: Taiwan
• performance part: Yes

shipping fuelegress:

• type: Fixed
• transit: 3-8 Days
• carrier: USPS
• cost: $0.00
• service: USPS First Class, USPS Priority Mail Small Flat Rate Box, USPS Priority Mail Express Flat Rate Envelope
• class: Standard, Expedited

general fuelegress:

• condition: New
• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Fuel Petcocks Taps

offer fuelegress:

• options: Ship-to-home
• quantity: 11
• availability: In Stock
• sold: 0
• started: June 24, 2025

seller fuelegress:

• rating: 98.8%
• # reviews: 14432
• city: Collegeville, Pennsylvania

returns fuelegress:

• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

payments fuelegress:

• wallet: Apple-pay
• credit card: Visa
• other

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