Adapters -Pneumatic Metal Air Hose Quick Coupler Plug Connectors 20sh+20ph Highlights Generic Pneumatic Metal Air Hose Quick Coupler Plug Connectors 20sh+20ph 100% brand new and high quality Nickel Couplers iron plated and case hardened steel caps to resist rust All external thread with sealant, better sealing Galvanized steel coupler features high corrosion resistance and long service life Air tool fitting kit , air compressor, air nailer, air gun, pressure washer, air hose Specification: Material: nickel plated iron Color: Silver Size Chart: 20SP: Length: 5cm (for PU hose outer diameter : 8mm; internal diameter: 5/5.5mm) 20PP: Length: 4cm (for PU pipe outer diameter: 8mm; inner diameter: 5/5.5mm) 30SP: Length: 5cm (for pipe outer diameter of PU: 10mm; inner diameter: 6.5mm) 30PP: Length: 4cm (for PU pipe outer diameter: 8mm; inner diameter: 5/5.5mm) 40SP: Length: 5.5cm (for PU pipe outer diameter : 12mm; internal diameter: 8mm) 40PP: Length: 4.5cm (for PU pipe external diameter: 12mm; internal diameter: 8mm) 20SH: 5.3x1.5cm (for internal diameter: 8-9mm) 20PH : 6x2.5cm (for inner diameter: 8-9mm) 30SH: 6.3X2.5cm (for inner diameter: 10-11mm) 30PH: 5.3X1.5cm (for inner diameter: 10-11mm) 40SH: 6.3X2 .5cm (for inner diameter: 12-13mm) 40PH: 5.8X1.5cm (for inner diameter: 12-13mm) 20SM: 4.8X2.5cm (for outer diameter: 13mm, male: 1/4) 20PM: 3.8 x1.5cm (for outer diameter: 13mm, male: 1/4) 20SF: 4.5x2.5cm (for inner diameter: 13mm, female: 1/4) 20PF: 3x1.8cm (for inner diameter: 13mm, female: 1 /4) 40SM: 5x2.5cm (for outer diameter: 20mm, male: 1/2) Package includes: 1 piece Pneumatic hose coupler Note: S for female, P for male, SH+PH and SP+PP these two models are specifically for trachea products. And with an internal and external thread SM + PM and SF + PF is a special seal. If the air tightness requirements can be selected if the SP+PP, if the air tightness is not high, you can choose SH+PH Pls allow 1-3mm error due to the manual measurement difference.