45 Litre Universal Underfloor Fresh Water Tank with Topfill System

This 45-litre universal underfloor fresh water tank offers a dependable and discreet solution for campervan and motorhome conversions of all types. Designed for flexible installation across a wide variety of vehicles, it provides secure, hygienic fresh-water storage while saving valuable interior space.

Constructed from durable, corrosion-resistant polyethylene, the tank features a matt black finish for a long-lasting, low-visibility underfloor installation. Its algae-resistant, hygienic design ensures reliable performance in long-term van builds.

A large threaded top-mounted access hatch allows the installation of pumps, internal accessories or sensors, and provides easy access for periodic cleaning.

Water level senders are available separately, including options compatible with
Victron Energy and SRNE systems. (Here)

Fitting Instructions

This tank can be installed widthways or lengthways, making it suitable for a wide range of van floor plans and chassis layouts.

Recommended mounting areas include:

Between chassis rails

Beside the fuel tank

Ahead of the rear axle

Within any suitable underfloor cavity

Installation notes:

The service hatch and topfill opening must face upward.

Keep clear of exhaust heat or use appropriate shielding.

Route the breather pipe upward to prevent siphoning.

Mount the topfill point in a convenient, accessible internal location.

Additional Benefits of the Topfill System

The included topfill system makes filling your fresh-water tank quick, clean and convenient—without requiring any cuts or modifications to the van’s exterior.

Key Advantages

Simple internal topfill design—no external filler required

Secure, splash-resistant fill point

 Ideal for both new conversions and retrofits

Compatible with standard 40 mm inlet hoses

Reduces installation complexity while keeping the van exterior unmodified

What’s Included

1 × 45L Water Tank
(Approx. 500mm (L) × 400mm (W) × 225mm (H))

1 × 1/2" Elbow for the breather line

1 × 1/2" Straight Connector for pump feed connection

1 × 1½" (40mm) Elbow for connecting the topfill inlet hose

1 × 1m long 1/2" Breather Pipe

1 × 1m long 40mm Blue Flexible Inlet Pipe (for topfill)

3 × Jubilee Clips for securing small-diameter pipes

  2 × 40mm Wire Clips for securing the inlet hose

1 × Universal Tank/Strap Fitting Kit with fixings

Important Information

Tank may contain traces of water from leak testing—this is normal.

Clean thoroughly before first use.

Specifications

Capacity: 45 litres

 Dimensions: 500mm (L) × 400mm (W) × 225mm (H)

Dry Weight: approx. 4kg