WASP W-4 Range


The WASP W-4 Fuel Filters offer a new cost effective range of primary filtration equipment for marine, heating, industrial and transport applications. Available with either a clear plastic or metal bowl. All the models are made from aluminium (the W-4ST has a transparent plastic bowl), and are available with an optional mounting bracket.



  • 36 litres per hour flow rate at minimal pressure drop (see technical tab)
  • Plastic or metal bowls
  • Lightweight
  • Compact
  • Choice of separators, paper elements or long life stainless steel
  • LM6 grade aluminium filter heads with reversible stainless steel bracket & bolts
  • Powder coated aluminium filter heads for corrosion prevention & long service life
  • 1/4” or 3/8” BSP ports
  • Sold in pack sizes of 50 pieces
  • Aluminium head, aluminium or clear plastic bowl

Product Range

W-4 range Filtration (micron) Details
W-4STM/0015P 15mic paper (pleated) 1/4” Ports, Metal bowl
W-4STM/006 60mic stainless steel (pleated)
W-4STM/006L 60mic stainless steel (straight)
W-4STM/01 100mic stainless steel (pleated)
W-4STM/01L 100mic stainless steel (straight)
W-4ST/0015P 15mic paper (pleated) 1/4” Ports, Clear bowl
W-4ST/006 60mic stainless steel (pleated)
W-4ST/006L 60mic stainless steel (straight)
W-4ST/01 100mic stainless steel (pleated)
W-4ST/01L 100mic stainless steel (straight)
W-4STM-38/0015P 15mic paper (pleated) 3/8” Ports, Metal bowl
W-4STM-38/006 60mic stainless steel (pleated)
W-4STM-38/006L 60mic stainless steel (straight)
W-4STM-38/01 100mic stainless steel (pleated)
W-4STM-38/01L 100mic stainless steel (straight)
W-4ST-38/0015P 15mic paper (pleated) 3/8” Ports, Clear bowl
W-4ST-38/006 60mic stainless steel (pleated)
W-4ST-38/006L 60mic stainless steel (straight)
W-4ST-38/01 100mic stainless steel (pleated)
W-4ST-38/01L 100mic stainless steel (straight)


Product Spares and options

 W-70401  W-4 range mounting bracket and screw
 W-60450/0015P  Replacement 15 mic paper element
 W-60450/006  60 micron pleated stainless steel element
 W-60450/006L  60 micron straight stainless steel element
 W-60450/01  100 micron pleated stainless steel element
 W-60450/01L  100 micron straight stainless steel element
 W-3195  Gasket kit for 15 mic paper units
 W-3198  Gasket kit for straight stainless steel units
 W-3198V  Viton gasket kit for straight stainless steel units
 W-3199  Gasket kit for pleated stainless steel elements
 W-3199V  Viton gasket kit for pleated stainless steel elements


Install/ Maintenance


Carefully follow the flow direction shown by an arrow on the filter. The filter can be installed in any position although it is recommended to fit it vertically with the bowl pointing downwards in order to facilitate the separation of the water traces and the deposit of the filtered impurities.


Cleaning the filter is carried out by unscrewing the bowl. Carefully wash the filtering element with clean diesel, gas-oil or gasoline. Remount the unit and check that the seals are integral and well placed. Paper elements should be replaced as they cannot be reused. See relevant spares.

See the product service and support page.

Technical Spec

W-4 flow-pressure

Maximum operating pressure: 2barMax operating temp (metal bowl): 90OCMax operating temp (plastic bowl): 50OCCompatible with diesel and heavy oil    




w-4 dims

A - ¼” BSP or 3/8”

B - ¼” BSP or 3/8”

C - 61mm

D - 75mm   


Need help selecting a filter?

See our guide to help you select the most suitable filter for your needs.

Technical Support

How it works

See how the Separ filter works to separate water and particulate from fuel. 

SWK2000 flow diagram transparancy

How to Order

Call or email us to place your order. We accept ALL major credit and debit cards, bank transfer and also PayPal. 

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Expert advice

Unsure which spare parts you require? Or if a Separ filter will meet your requirements? 

Talk to our expert team. Call 01923 276 007



Delivery options

We have a wide range of shipping options available to suit your destination and budget.



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Contact Us

3 Kingley Park, Station Road, Kings Langley, Herts, WD4 8GW

Tel: +44 (0)1923 276007

Fax: +44 (0)1923 267463

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Here to Help

Product guides

Fuel Specs


Selecting a Filter