FatSac Female Quick Connect/Sac Valve Threads & Male Quick Connect CapAll FatSac fittings are machined in house and proprietary to the brand. This allows us to work creatively with OEM and custom sac customers to dial in exactly what you need. It also gives us control over the quality of fittings being used with our sacs. After all, the sac is only good if the fittings are airtight! The cap n chain fitting is sold with every Pro x Series FatSac as it is used to inflate bags using a Tsunami or Supa Pump. One side of the