I was going to send you to Woodward, but when I went to their website their "new" racks come with blue 2000 psi hoses -- my Woodward rack came with all black lines. The link below takes you to their site and the extract below is a discussion of why they changed hoses. Hope this helps.
Pappy
http://www.woodwardsteering.com/imag...components.pdf
Extract from link above:
High Pressure Hose PTFE core, stainless braid, soft cover Woodward Power Racks are now equipped with a new -6 hose rated for 2000 PSI working pressure. This hose replaces our former cloth-covered 1500 PSI hydraulic hose and its reusable type ends (shown at right for comparison).
IMPORTANT: There are many different brands of hose and reusable hose ends now in circulation, most of which are mutually incompatible. Because it can be difficult to tell them apart, racers in a hurry have been known to create mismatched hose assemblies from spare components. These may appear correct but can come apart under pressure. To prevent accidental mismatched field assemblies, WE USE ONLY PERMANENT CRIMP-TYPE ENDS ON OUR HPB6 PRESSURE HOSE. Although this hose conforms to the nominal standard dimensions of -6 stainless-braid PTFE hose, it also has an
abrasion-reducing fabric cover. The cover precludes the use of screw-on ends (the kind with a brass “olive”) which are intended only for uncovered stainless braid. Permanent ends are the ONLY type approved for use with this hose. Crimp tooling data will be made available to qualified hose shops on request.
Power Steering System Components
HOSE ADAPTERS, -6 o-ring to -6 AN/JIC male flare
STRAIGHT G180.............................................. ......3.25
45 DEGREE G145.............................................. ....4.95
90 DEGREE G190.............................................. ....4.55
BANJO HPB66MF........................................... ... 30.00
HOSE per foot HPB6.............. 7.95
STRAIGHT endHPB180......... 7.25
BANJO end HPB66.............. 32.50
90 end HPB190.................... 15.25
Assembly labor (per hose)...... 5.00