John Guest 3/8" Tube OD x 1/4" FFL Brass Connector | Lead-Free Flare Fitting for Beverage & Water
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John Guest 3/8" Tube OD x 1/4" FFL Brass Connector | Lead-Free Flare Fitting for Beverage & Water

John Guest 3/8" Tube OD x 1/4" FFL Brass Connector | Lead-Free Flare Fitting for Beverage & Water

The John Guest MI4512F4SLF Brass Connector is a high-performance, lead-free fitting designed to bridge 3/8" OD plastic tubing and standard 1/4" MFL (Male Flare) ports. Commonly found on CO2 regulators, gas manifolds, and keg couplers, this connector allows for a rapid, tool-free connection while maintaining the robust integrity of a brass flare seat. The lead-free brass construction ensures compliance with safe drinking water standards, making it ideal for both brewing and soda applications.

Featuring John Guest’s world-renowned push-fit technology, this fitting provides a permanent, leak-proof seal that can be disconnected and reused without damaging the tubing. The internal stainless steel collet teeth provide a secure grip, while the high-quality EPDM O-ring ensures an airtight seal. This specific fitting is essential for technicians and homebrewers who want to upgrade their gas or liquid lines to a modular, easily maintainable system.

Pro-Installer Tip: When connecting this to a plastic MFL port (like on some ball lock disconnects), be careful not to over-tighten, as the brass threads can strip the plastic. For a 100% gas-tight seal on the flare side, we recommend using a 1/4" Nylon Flare Washer between the metal flare seat and the mating port. Always use a locking clip on the push-fit side to prevent accidental tube release in high-vibration areas.
$4.99
John Guest 3/8" Tube OD x 1/4" FFL Brass Connector | Lead-Free Flare Fitting for Beverage & Water—
$4.99

John Guest 3/8" Tube OD x 1/4" FFL Brass Connector | Lead-Free Flare Fitting for Beverage & Water

The John Guest MI4512F4SLF Brass Connector is a high-performance, lead-free fitting designed to bridge 3/8" OD plastic tubing and standard 1/4" MFL (Male Flare) ports. Commonly found on CO2 regulators, gas manifolds, and keg couplers, this connector allows for a rapid, tool-free connection while maintaining the robust integrity of a brass flare seat. The lead-free brass construction ensures compliance with safe drinking water standards, making it ideal for both brewing and soda applications.

Featuring John Guest’s world-renowned push-fit technology, this fitting provides a permanent, leak-proof seal that can be disconnected and reused without damaging the tubing. The internal stainless steel collet teeth provide a secure grip, while the high-quality EPDM O-ring ensures an airtight seal. This specific fitting is essential for technicians and homebrewers who want to upgrade their gas or liquid lines to a modular, easily maintainable system.

Pro-Installer Tip: When connecting this to a plastic MFL port (like on some ball lock disconnects), be careful not to over-tighten, as the brass threads can strip the plastic. For a 100% gas-tight seal on the flare side, we recommend using a 1/4" Nylon Flare Washer between the metal flare seat and the mating port. Always use a locking clip on the push-fit side to prevent accidental tube release in high-vibration areas.

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The John Guest MI4512F4SLF Brass Connector is a high-performance, lead-free fitting designed to bridge 3/8" OD plastic tubing and standard 1/4" MFL (Male Flare) ports. Commonly found on CO2 regulators, gas manifolds, and keg couplers, this connector allows for a rapid, tool-free connection while maintaining the robust integrity of a brass flare seat. The lead-free brass construction ensures compliance with safe drinking water standards, making it ideal for both brewing and soda applications.

Featuring John Guest’s world-renowned push-fit technology, this fitting provides a permanent, leak-proof seal that can be disconnected and reused without damaging the tubing. The internal stainless steel collet teeth provide a secure grip, while the high-quality EPDM O-ring ensures an airtight seal. This specific fitting is essential for technicians and homebrewers who want to upgrade their gas or liquid lines to a modular, easily maintainable system.

Pro-Installer Tip: When connecting this to a plastic MFL port (like on some ball lock disconnects), be careful not to over-tighten, as the brass threads can strip the plastic. For a 100% gas-tight seal on the flare side, we recommend using a 1/4" Nylon Flare Washer between the metal flare seat and the mating port. Always use a locking clip on the push-fit side to prevent accidental tube release in high-vibration areas.