Freeze stop spray guns

What is the difference between the versions freeze stop and weep?

In case of the weep design, there is a groove or notch in the seal seat of the valve which allows a reduced quantity of water to pass even if the lever is not actuated. This is effected in high-pressure mode if the high-pressure pump is activated as well as in low-pressure mode with water pipe pressure.

The so-called frost stop guns use a "valve-in-valve" technology, i.e. the actuating valve operated by means of the gun lever includes the actual automatic frost stop valve. By means of the actuating valve, the gun is opened and closed for cleaning purposes as usual. The integrated frost stop valve is activated only in low-pressure mode (water pipe pressure). It is spring-operated and opens if the applied pressure falls short of about 5 bar. If this pressure increases, e.g. by activating the high-pressure pump, the frost stop valve closes automatically. Washing comfort is thus increased since no water escapes when the lance is removed from the holder.