These water/holding tanks are constructed and designed to meet both waterand holding applications. All tanks are constructed from polyethylene making it strong and durable. The openings are all standard sizes and easily adapt to any vessel. These tanks have all female NPT openings consisting of, two 1-1/2" fill, one 1/2" vent,and one 1/2" supply. All of the openings are located on one end of the tank. Fitting kits are not included Complies with FDA regulations CFR 177.1520 Meets Coast Guard standards Part Number Gallons Description 7015206 6 16" L x 12" W x 8" H 7015209 9 17" L x 14" W x 10" H 7015213 13 24" L x 10" W x 14" H 9921-275 15 25" L x 11" W x 15" H 7015220 20 30" L x 16" W x 10" H 7015235 35 36" L x 15" W x 16" H 7015255 55 54-1/2" L x 13" W x 20" H
