This Kegland Blowtie Diaphragm Spunding Valve Complete Kit includes everything, even the ball lock disconnect.
If you want to control the pressure retained in a pressure vessel that is releasing pressure then the BlowTie Diaphram Spunding Valve is the tool for the job.
The adjustment knob on the top of the unit makes it easy to increase and decrease the set pressure.
This BlowTie unit can be easily disassembled for cleaning using a Phillips head screwdriver.