Eastern Penn Supply 27289 Route 75 North Mifflintown PA 17509 EPSCO has grown to be one of the largest wholesale supply houses in the Eastern Pennsylvania area. In 2017 EPSCO joined Hajoca Corporation the nations largest privately held wholesale supply house of plumbing heating and industrial supplies. AREAS SERVED: EPSCO has plumbing and HVAC supply houses throughout Pennsylvania. BRANDS CARRIED: EPSCO carries name brands such as Amtrol AO Smith Burnham Diversitech Luxaire New Yorker Petite Samsung Southwark Taco TracPipe Viega Honeywell and many more.