2820-5-5 Parker 20 Series Straight Hose FittingParker's 20 Series Fittings are field attachable (reusable) style fittings, which enable you to quickly and easily make hose assemblies right on the job site without special tools. The 20 Series fitting assemblies do not require removing the outer cover or inner tube of the hose, eliminating premature hose failure caused by skiving too much or too little. Parker's 20 Series fittings are primarily used with engine airbrake and marine gas hoses.