Features Safer Locking: Built in high hardness steel ball ensures easy and secure connection as well as 20kgf/cm² maximum pressure. Female Thread: The clear female thread simplifies the connection, also very durable with wearing and not likely to crack. 5 Sets in All: There are 5 sets of coupler in the kit, and the largely quantity will meet your needs for replacement. Good Material: Adopting high quality plastic steel material, the pneumatic fitting is rustproof and sturdy with corrosion. Easy to Install: Comes with a light weight and a compact size, the convenient installation can be completed in minutes. Feature: 1. Safer Locking: Built in high hardness steel ball ensures easy and secure connection as well as 20kgf/cm² maximum pressure. 2. Female Thread: The clear female thread simplifies the connection, also very durable with wearing and not likely to crack. 3. 5 Sets in All: There are 5 sets of coupler in the kit, and the largely quantity will meet your needs for replacement. 4. Good Material: Adopting high quality plastic steel material, the pneumatic fitting is rustproof and sturdy with corrosion. 5. Easy to Install: Comes with a light weight and a compact size, the convenient installation can be completed in minutes. Specification: Item Type: Pneumatic Fitting Material: Plastic Steel Maximum Pressure Resistance: 20kgf/cm² Working Pressure: 0~0.92kgf/cm² Operating Temperature: -35℃~60℃ Model Thread ID(Approx.) Thread Model SF+PF‑20 13mm / 0.51in R1/4 SF+PF‑30 13mm / 0.51in R3/8 SF+PF‑40 13mm / 0.51in R1/2 Package List: 5 x Connector 5 x Locking Head Note: 1. During the use of the joint, do not frequently pull out and insert the tube, which will affect the service life of the joint and the 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 leakage. 3. When pulling out the 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 tube. Package List 5 x Connector 5 x Locking Head