Features 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 air 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