Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

High-Pressure Flex Hose Identification

PDO.0067 Ver. 1.0 November 28, 2022
Hexagon® Agility® CNG fuel systems may include high-pressure hoses approved for compressed natural gas
(CNG) use manufactured by several suppliers including Motion Industries, Titeflex, Parker, and Swagelok®. Key
characteristics of each hose type are provided below to assist inspection.

Motion Industries hose – stainless steel braid
Motion Industries high-pressure CNG hoses are electrically conductive and coated with a thermoplastic outer
jacket. A typical high-pressure CNG hose manufactured by Motion Industries (Figure 1) may be identified by the
following characteristics:
 exposed stainless steel braid between outer jacket and collet
 indentations on collet crimp area
 metal ID tag with manufacturing and date code. Figure 2
plastic cover

stainless steel braid

crimp marks

tube stub

collet

Figure 1. Motion Industries flexible CNG fuel hose. Note longitudinal crimp marks on collet and unmarked plastic
cover (jacket).
metal ID tag

Figure 2. Motion Industries CNG hose metal ID tag includes date of manufacture (circled).

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

Titeflex hose – stainless steel braid
Titeflex high-pressure CNG hoses consist of an electrically conductive PTFE inner core with a DuPont Hytrel®
thermoplastic outer jacket, and are temperature rated from -40°F to 250°F (-54°C to 121°C). Titeflex hoses
(Figures 3 and 4) typically possess the following distinguishing features:
 Exposed stainless steel braid between outer jacket and collet
 Plastic coated paper tag (may or may not be present)
 Titeflex marking and information specific to the hose properties and fuel type on the jacket
plastic cover

markings

stainless steel braid

collet

compression fitting

Figure 3. Titeflex flexible CNG fuel hose identifying characteristics.

Figure 4. Left: Titeflex plastic coated paper tag may or may not be present.
Right: Titeflex hose outer jacket is imprinted with “TITEFLEX” branding, date of manufacture
(circles), and maximum pressure and temperature range ratings.

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

Parker Parflex® 5CNG – fiber reinforced hose
Parker Parflex® 5CNG reinforced nylon hoses do not have a stainless steel braid and may be identified partially
by the red polyurethane cover. Parflex hoses are electrically-conductive and temperature rated from -40°F to
180°F (-40°C to 82°C). Figures 5 and 6

crimped collet

coiled strain relief

red plastic outer jacket

Figure 5. Parker Parflex 5CNG fiber reinforced nylon CNG hose identification. NOTE: Coiled spring strain relief
may not be present in all applications.
metal ID tag

2
Figure 6. Left: Parflex 5CNG hose metal ID tag includes a plant code, manufacturing location, and
manufacturing date code (not visible).
Right: Parflex 5CNG outer jacket is marked “ELECTRICALLY CONDUCTIVE” and rated for CNG.
NOTICE Parker recommends visual inspection of hose assemblies on at least a monthly basis.
WARNING Any of the following conditions require immediate removal of the vehicle from service and
replacement of hose assembly:
1. Fitting slippage on hose
2. Damaged, cut, or abraded cover (any reinforcement exposed)
3. Hard, stiff, heat cracked, or charred hose
4. Cracked, damaged, or badly corroded fittings
5. Leaks at fitting or in hose
6. Kinked, crushed, flattened, or twisted hose
7. Blistered, soft, degraded, or loose cover
Refer to Parker Safety Guide, Parker Publication No. 4400-B.1, for more information.

Reviewers Note: Words/phrases in blue will be links to specific diagnostic procedures when this document is published in Freshdesk.

Swagelok® NG Series – fiber reinforced hose
Swagelok NG Series hoses do not have a stainless steel braid and may be identified partially by a perforated
polyurethane cover. Nylon Swagelok NG hoses feature fiber reinforcement, are electrically conductive, and are
temperature rated from -40°F to 150°F (-40°C to 65°C). Figures 7 and 8

stainless steel end

crimped collet

perforated plastic outer jacket

Figure 7. Swagelok NG Series hoses feature crimped collets, perforated polyurethane outer jacket, and stainless
steel ends.

Figure 8. Left: Swagelok NG Series hose outer jacket marked “SWAGELOK®” with size and pressure rating and
“ELECTRICALLY CONDUCTIVE”.
Right: Swagelok hose decal includes date of manufacture (DOM) (circled).