Corrosion resistant 2 chamber diaphragm pump fitted with an on-demand pressure switch provides reliable flow for up to two fixtures. Able to run dry without damage, self-primes up to 4\', and meets ISO 8846 Marine ignition protection. Rubber mounting feet absorb vibrations and reduce noise. Pumps have 3/8\" FNPT ports and come with \" hose barb and QEST (NPS threaded) fittings. 3.75\" H x 3.75\" W x 8.2\" L.