PolyJohn Fleet Series The PolyJohn Fleet Series units are designed to look more like home toilets, plus you can order a customized unit with sink and urinal. A unique ventilation system enhances air flow through the unit for greater comfort. The Signature Series is designed with the bowl projected beyond the tank for ease of use and unequaled hygiene. A rain gutter built into the door eliminates cascading water when the door is opened.