Chem-Feed C-1500N diaphragm metering injector pumps have a permanently lubricated gear motor for smooth, quiet performance. The valve body and fittings are constructed of chemical resistant PVDF. Valves have FKM static seals and TFE/P ball seat O-rings. The diaphragm is made of PTFE-coated EP. The design allows for a minimum stroke length of 5%. Time is adjustable from 5% to 100% of the repeating 5-second time interval, which results in precise, high-frequency injections. The pump is NSF, ETL, CSA and CE listed.