WASP W-20/W-25/ W-NAPFG Service

w 20

Install/ Maintenance


A full range of fittings is available for easy installation.

  1. If necessary refit the two port plugs supplied with the filter. If they are not to be repositioned check they are correctly tightened.
  2. Follow the flow direction according to the arrows on each of the four ports.
  3. This range of filters should be installed on the suction side of the fuel supply system before the lift pump.


  • Check regularly for separated water
  • Drain off any separated water or impurities regularly via the thumb screw drain plug or valve
  • Remove clean and re-fit the stainless steel element as necessary
  • Replace seals and paper elements as required, see above spares

Spares and options

W-2301 Replacement seal kit
W-2302 Replacement 20 micron paper element and seal kit
W-2303 Replacement 150 micron stainless steel element only


 Click for more information on the W-20/W-25/ W-NAPFG rangesW-20/W-25/ W-NAPFG ranges



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