About Guenther Supply, Inc. Starting a small business back in the 1940’s and early 1950’s, Gordon Guenther, along with his brother Marvin, built walk-in coolers, refrigeration equipment, and retailed plumbing, heating, and refrigeration supplies.

In 1956, Guenther Supply was founded when Gordon Guenther and Lyle Trader ventured into the wholesale supply business, selling plumbing, heating, and refrigeration supplies, then adding petroleum-handling equipment.

In 1963, Raymond Zwicky joined the firm, providing valuable business experience to the young company. Ray served as President of Guenther Supply, Inc. from 1972 until his retirement in 1990.

Through the next few decades and into the present, Guenther Supply, Inc. grew consistently. To meet customers’ needs, Guenther Supply added new product lines of pipe, valves and fittings, and related items. New facilities were put up to house the increasing inventories.

Today we have a fully integrated computer system offering real-time inventory availability. We have a busy shipping department and a fleet of delivery trucks to get our products to our customers. And we continue to grow.

Keeping pace with modern technology, we offer our customers the most innovative tools and products in the market. We have a knowledgeable full-time staff working together and dedicated to customer satisfaction.



Company Directory

Guenther Supply Board of Directors


  • Robert G. Zwicky – President/Treasurer
  • Kim Ayars – Executive Vice President
  • Karen Kraus – Vice President/Secretary

Staff Administration

  • Robert G. Zwicky – General Manager
  • Karen Kraus – Accts. Payable Manager
  • Kim Ayars – Accts. Receivable Manager
  • Hannah Zwicky – Accts. Receivable/Accts. Payable
  • Hailey Hutter – Purchasing Manager
  • Don Steffes- Purchasing
  • Brenda Allen – System Administrator
  • Deb Dehring – Administrative Secretary

Sales Manager

  • Michael Perry, “Mich”

Inside Sales

  • Steve Wojahn
  • Corey Keller
  • MJ Shady
  • Linda Steffes
  • Jozalyn Penn
  • Troy Masteller
  • Joseph “Joey” Trusk

Outside Sales

  • John Trtan
  • James Nett-Bin Management

Warehouse Manager

  • Darren Weber

Shipping Manager

  • Brian Kopf

Receiving Manager

  • Danielle Burden

Fleet Manager

  • John Beck

Warehouse Staff

  • Ken Warriner
  • David Binning
  • Damion Mireles
  • Zach Shady
  • Joey Liebelt
  • Gavin Hood
  • Corey Atkins