Item Type: Pneumatic Fitting Material: Plastic Steel Maximum Pressure Resistance: 20kgf/cm Working Pressure: 0~0.92kgf/cm Operating Temperature: -35~60 ModelThread ID(Approx.)Thread Model SF+PF2013mm / 0.51inR1/4 SF+PF3013mm / 0.51inR3/8 SF+PF4013mm / 0.51inR1/2 Package List 5 x Connector 5 x Locking Head 1. During the use of the joint, do not frequently pull out and insert the air tube, which will affect the service life of the joint and the air tube. 2. When the pipe is inserted into the joint, it needs to be inserted into the bottom of the joint to avoid the possibility of air leakage. 3. When pulling out the air tube, first confirm that there is no pressure in the tube, press the end caps of the joint to the end and pull out the air tube. 1Safer Locking: Built in high hardness steel ball ensures easy and secure connection as well as 20kgf/cm maximum pressure. 2Female Thread: The clear female thread simplifies the connection, also very durable with wearing and not likely to crack. 35 Sets in All: There are 5 sets of air coupler in the kit, and the largely quantity will meet your needs for replacement. 4Good Material: Adopting high quality plastic steel material, the pneumatic fitting is rustproof and sturdy with corrosion. 5Easy to Install: Comes with a light weight and a compact size, the convenient installation can be completed in minutes.