The S Series is an entry-level screw-together poppet style coupling, available in a wide range of sizes.
These fittings will connect with residual pressure in one side only, and are not suitable for use with impulse loads.
The S Series are a great budget-friendly option for a connect-under-pressure coupling suitable for use on augers, vibrating plates, shears etc.
These are not suitable for use on 4-in-1 buckets, hammers, grabs or any application where a shock load or impulse load may be present.