Dudley exposed plastic cisterns have established an unrivalled track record in millions of successful installations. Our light to medium duty cisterns are perfect for use in domestic and commercial applications whilst the Tri-Shell and Tri-Well heavy duty cisterns are proven to withstand the hardest of treatment. The Dudley Tri-Shell Turbo is ideal for use in most domestic and commercial applications, particularly those where there may be the potential for vandalism or misuse.