Wisco Products Logo

Filler Caps and Accessories

For Manufacturers of Rail Locomotives, Marine and Racing Vehicles, Liquid Processing Systems
and Storage, and Heavy Duty Off-Road, Construction, Mining, Farm and Forestry Equipment

300 Series Filler Caps  

Our high quality, precision-fabricated caps provide excellent performance for a variety of fluid systems.

For use with water, fuel, oil and hydraulic applications
Heavy-duty locking cup and diaphragm
20 gauge (.036 in) steel or stainless steel cover and cup
300 Series caps pressure tested to 10 psi
Series 300 Filler Caps photo
Series 300 Filler Cap dimensions
 
Style Material Plating Gasket
Material
Venting
(option)
Decal
(option)
Chain
(option)
Lock Tab
(option)
Dipstick
(option)
 
301
Knurled
Knurled 300 Filler Cap diagram
.PDF | .DWG


302
Plain
Plain 300 Filler Cap diagram
.PDF | .DWG


303
Scalloped
Scalloped 300 Filler Cap diagram
.PDF | .DWG


304
Fixed Handle
Fixed Handle 300 Filler Cap diagram
.PDF | .DWG


305
Decal
300 Filler Cap with decal diagram
.PDF | .DWG


306
6600 Shell
6600 shell 300 Filler Cap diagram
.PDF | .DWG

 

 
Steel

Stainless
Steel
 
Zinc,
Clear

Zinc,
Yellow
 
2651
Synthetic
Rubber
(MIL-R-6855)

2651-1
Ethylene
Propylene

2651-5
Viton

3455
For Oil -
Synthetic
Rubber
(MIL-R-7362)

4050
Fluoro-
Silicone
(MIL-R-25988)

4825-1
Fibreflex
(Pressboard)

4969
Molded
Rubber
(ASTMD 2000)
 
Nonvented

Vented
 
For 305 & 306
styles only


Fuel
(Diesel shown)
Fuel filler cap decal

Oil
Oil filler cap decal

Hydraulic
Hydraulic filler cap decal

Hydraulic
(alternate)
Hydraulic filler cap decal style 2

Other
(Specify)
 
Stainless
Link
Safety Chain diagram

"S" Hook
S-hook diagram
 
Steel

Stainless
Steel

Series 300 Filler Cap Lock Tab diagram
 
Spot welded
to cup
(specify length
and markings)

Solid Dipstick
Series 300 filler cap solid dipstick diagram


Flexible Dipstick
Series 300 filler cap flexible dipstick diagram


View our dipstick reference