Tank fillers

Cover screws for fuel, water and septic systems.

Tank fillers group products

Deck Filler 38mm, water
Campaign
Available
39,00 €55,00 €
Deck Filler 38mm, diesel
Campaign
Available
39,00 €54,00 €
Deck Filler 38mm, diesel, stainless steel
Campaign
Available from the supplier
79,00 €99,00 €
Deck Filler 51mm, diesel
Available
59,90 €
Deck Filler 51mm, fuel
Available from the supplier
58,00 €
Roca Deck Filler 38mm, 45°
Available
53,00 €
Roca Deck Filler 38mm, straight
Available
50,50 €
Roca Deck Filler 50mm, straight
Available
50,50 €
Roca Deck Filler 50mm, 45°
Available
53,00 €
Replacement Cover for Deck Filler, septic tank
Available from the supplier
44,00 €
Replacement Cap for Deck Filler, septic
Available
15,50 €
O-ring for Deck Filler 36mm
Available
3,70 €
Osculati Universal Deck Filler Key, stainless steel
Osculati Deck Filler Key
Available
8,00 €
Roca Deck Filler Cover and Handle, gas
Available
42,00 €
Roca Deck Filler Cover and Handle, diesel
Available
42,00 €
Roca Deck Filler Cover and Handle, unleaded petrol
Roca Deck Filler Cover and Handle, fresh water
Roca Deck Filler Cover and Handle, septic tank
Roca Deck Filler O-ring
Available
5,50 €

Recommended for you

Cover screws – filler holes for water and fuel tanks

In the cover screws product group you will find cover-mounted filling openings and their accessories for filling water tanks. The selection includes a Roca brand cover screw cover and handle for freshwater use, a Rorsman brand 38mm cover screw, an O-ring for the 36mm cover screw for sealing, a blue cover screw cap and Osculati brand keys (hexagonal and stainless universal key) for opening and tightening the cover.

The purpose of the cover screw is to allow the tank to be filled directly from the deck without having to take the filling hose indoors – this is especially practical when filling in a harbor or at a water point. The tightness of the cover screw is important: a worn or damaged O-ring will allow water or dirt to enter the tank from around the deck, so it is worth checking the condition of the sealing ring regularly and replacing it if necessary.

A color-coded cap (e.g. blue for water) helps to distinguish different tank types on deck, which is important for safety, especially on boats with both water and fuel tanks side by side – filling the wrong tank is absolutely essential. It is a good idea to always carry a key with you on the boat, as a tightly tightened cap can be difficult to open by hand.

The condition of the O-ring on the filler cap is a crucial part of the tightness of the entire filler opening: a worn or cracked sealing ring allows water, dirt or salt to enter the tank from around the cap, which can spoil the quality of the water in the tank or cause corrosion in the fuel tank. It is worth checking the sealing ring and replacing it if necessary annually, especially before long winter storage, when the cap is exposed to snow and ice.

A color-coded cap (e.g. blue for water) is an important safety feature, especially on boats with multiple tank types close together on deck – filling the wrong tank with fuel or water can cause serious problems for the engine or water system. It is a good idea to always keep an Osculati wrench on the boat in a fixed place, as a tightly tightened screw can be surprisingly difficult to open by hand, especially if the surface of the deck is wet or the gripping surface of the wrench is worn. It is worth checking the dimensional differences between the Rorsman and Roca models (e.g. 38mm) carefully before ordering, as cover screws from different manufacturers are not always interchangeable.

Keep an extra O-ring and cap in your boat backpack – these small parts wear out unnoticed and missing them mid-trip will prevent the tank from being completely filled safely.

Clearly mark the location of the lid screw so that a new user or visitor does not accidentally fill the wrong container in a hurry.

Fast delivery
For products in stock, 1-3 workingdays. For ordering products, 2-7 days.
Customer service
010 548 5605 (days 9-18) asiakaspalvelu@marinekauppa.com
14-day right of return
Products have a 14-day free return right. All products have a minimum 6 month warranty.
Pay securely
Secure online payments. Pay with online banking, credit card, invoice or partial payment.

CONTACT INFORMATION

Our customer service is available on weekdays 9-17.
email: asiakaspalvelu@marinekauppa.com

STORES

HELSINKI
Veneentekijäntie 3
00210 Helsinki (Lauttasaari)
FINLAND
mon–fri 9–18
sat-sun closed

VANTAA
Porttisuontie 13
00120 Vantaa (Porttipuisto)
FINLAND
mon–fri 10-18
sat-sun closed

COMPANY INFORMATION

Marinekauppa.com / Norcap Oy Ab
Company ID 1827467-5
Founded in 2003
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