Preforms Plus (PPI) manufactures PET preforms and bottles at two locations; Amherst, NH and Milford, NH. PPI specializes in c ... ustom bottles. Bottle sizes range from 2.5oz to 4 gallon (15 Liter). We also provide hot fill bottles or jars. Preforms are available for sale. DevTech Labs (DTL) provides design and engineering services to the PET industry. read more