Adaptable to your individual needs- stainless steel hammer Arresters are available for all types of fluid systems water, deionized and triple distilled water, chemicals and petroleum products. Finished to your specifications- When ordering, the expected mean spike pressure must be specified as well as the chemical make-up of the fluid in the system and the maximum temperature. Arresters may be charged at the factory with either air or dry nitrogen per your specification. If Arresters are to be used in systems pumping volatile fluids it is mandatory that they are charged with dry nitrogen.