Check valve with elastic sealing diaphragm fits to a male or female Luer mating connection. The low mating force significantly reduces the risk of stress cracks at female Luer connecting pieces. 
 
Opening pressure (when first used).  ? 6 mbar
 
Opening pressure (after closure of the check valve)   ? 12 mbar
 
Counterflow pressure resistance   5 bar for 15 minutes
 
Pressure resistance in flow direction   6 bar