This faucet cleaning adapter is the same one we use with out Beer Line Cleaning Kit. To uses this product simply remove the beer faucet from the shank and replace it with this adapter. The adapter can be used with 5/16 ID hose, a clamp is not normally needed, unless you have excessive pressure on the system. The barb on this adapter is 7mm, which is approximately 9/32 SAE. This works well with 5/16 ID or 3/8 ID (recommend clamp with 3/8 ID).
The plastic used in this adapter is food grade and it is very durable. The adapter has an O-ring on the inside to seal with the shank. Do not over tighten, just need to be tight enough for O-ring to seal.