Versa-Matic E1 Series Double Diaphragm Pump. Model: Bolted Metallic E1. Material of construction: Aluminum. Nominal capacity: 35 gpm. Maximum particle size: 0.125 in. diameter. Versa-Matic's E1 1" is self-priming and features a corrosion-resistant air valve system that virtually eliminates icing, stalling, and the need for lubrication. Port sizes: 1-1/2 in. threaded (female)NPT, air inlet/exhaust: 0.375 in. diameter NPTF/NPT. Overall dimensions: 11 in. L x 10 in. W x 15 in. H.(ACN6a).