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Advantage of second-generation products:

- Provide an easily handling adjustor to avoid leakage or ejection by accident

- Good balance of the spool reduces the wear of seal ring and prolongs its lifetime. This improves leak-proof performance of foam guns

Disadvantage of the traditional adjustors:

- Traditional adjustors are quite tight and difficult to handle. The users tend to ignore this device. But using foam guns without following regulation can cause leakage or ejection by accident.

- When adjustor is turned tight, the tension of spring becomes strong, so is the handle. This will cause non-uniform swing of spool when it moves back and forth. Followed by swear of seal ring and leakage of foam guns.