SKU: CPF2309 Harlequin
£16.67 (excl. VAT)
£20.00 (incl. VAT)

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Lockable Cap Harlequin 4 inch Replacement Retrofit kit

D Diesel G Gas Oil H Heating Oil Price Promise Guarantee

Product Specification

Additional Information


Fluid Type

Diesel, Gas Oil, Heating Oil


Lockable Cap for Harlequin Oil Tank 4 inch

Harlequin Manufacturing Leading manufacturer of innovative polyethylene storage tanks and also systems


Plastic locking retrofit cap Compatible with all Harlequin oil tanks.

Replace the black 1/4 turn locking cap also 4″ black screw cap with a female thread.

  • Supplied with fitting instructions
  • Supplied as standard on all new Harlequin oil tanks.
  • Fits existing tank opening.
  • Retro-fit any Harlequin fuel tank.
  • Fitment instructions also included


Note: You will be required to screw brackets down onto your tank.


May also be compatible with other branded tanks too. Contact Us



Harlequin is a leading manufacturer of innovative polyethylene storage tanks and systems. Headquartered in Northern Ireland, UK, it has a 35-year heritage and also exports to over 20 countries internationally too. Harlequin Manufacturing has developed a diverse and innovative product range and is one of the fastest growing manufacturing companies in Northern Ireland and with over 90 employees. Exceptional customer service is at heart of Harlequin’s business; supplying quality products within a trusted and professional service. The company has a number of internationally recognised management system certifications including ISO 9001, 14001 and also 45001. Harlequin is a member of OFTEC and British Water.

Tank Services

We pride ourselves on friendly and helpful attitude. If we can’t provide you with a service due to distance we will happily provide a team nearer to your premises.
Aside from that, any questions you may have about any of our products or services will be dutifully answered by our in house specialists. Call 01722 714514 for any advice you need and we’ll be happy to help you! You can also contact us using our Contact Form


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