This Kit Includes:
1 x BlowTie Diaphragm Spunding Valve
1 x duotight – 8mm (5/16”) Female x 8mm (5/16”) Female Double Tee Piece
1 x duotight – 8mm (5/16”) Female x FFL Female Thread
1 x 8mm Push In Pressure Gauge 0-15psi
1 x Premium Ball Lock Disconnect (MFL) Grey/Gas
2 x 8mm Rigid Plaster Joiner

This kit has been designed for simplicity and ease of putting together. 
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.
This BlowTie unit can be easily disassembled for cleaning using a Phillips head screwdriver.