The Coxreels offers a line of Biodiesel Reels for use with concentrations above B5 biodiesel. For concentrations above B5, stainless steel plumbing should be used with Viton seals and non-sparking pawls. For these circumstances, Coxreels offers Nos. SHF-N-525-BBN, TSHF-N-XXX-BBN or TSHL-N-635-BBN. In concentrations above B20, Viton seals must be used along with a special hose, the Flexwing VersaFuel Hose, No. TSHF-N-620-BBN.