Self-priming and self-lubricating. Easy to clean. Will not mar boat. Solvent welded construction. Will withstand temperature to 120degree;. Special all polyvinyl body and shaft. Non-conductive,non-corrosive. With seal. Made in USA. Available in 3 sizes: 6 GPM 18"L x 1 1/4" Diameter 10 GPM 24" L x 1 3/4"Diameter 13 GPM 36" L x 1 3/4" Diameter.