QUICK CONNECTORS ARE DESIGNED FOR THE AUTOMOTIVE INDUSTRY FOR THE TRANSFER OF FUEL, OIL, WATER COOLING SYSTEMS AND AIR.
PLEASE NOTE, THESE ARE NOT AUTO-SEALING.THIS TYPE DOES NOT HAVE A SHUT OFF MECHANISM BUILT IN.
This allows you to quickly connect the fuel lines by pusing-in and disconnect by simply pulling out while pressing the lock buttons. 

It is made of quality materials compatible with fuel/gas, and other common fluid types. 
Made to SAE J2044-2009 standards.
Specification:
Body Material: PA12+30GF
O-Ring Material: FKM
Max Back Pressure: 500 KPa/5 Bar
Temperature: -40C-115C (-40F-239F) 
Nylon hoses with Internal Diameter around 5/16" (8mm). You may need to use professional tools to connect Nylon hoses
 Rubber hoses with Internal Diameter around 3/8" (9-10mm). You may need to use a hose clamp to fasten.