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800-233-7718 301-682-3390 WHITE PAPERS Need immediate assistance? Contact us for a Lunch and Learn session using the form on the right side of this page. Horizontal vs Vertical Pumps Axiel Grinding Jockey Pump Sizing Oil-Filled vs Air-Filled Motors Fire Pump Disconnect Two Pole vs Four Pole Motors View Our Products CONTACT US As of July 2021, we will no longer be supporting Internet Explorer. While the majority of our site will function normally in this browser, we cannot guarantee that all aspects will function. Microsoft recommends upgrading to their Edge browser as they no longer support Explorer (including security updates). We would also recommend trying Google Chrome or Firefox. All three options are free downloads and well-supported. Name* Email* Phone* I'm interested in* Agricultural Booster Controls Specialist Fire Pumps Non-Clog & Dry Pumps Rain Harvest Waste Water Service Parts Preventative Maintenance Lunch & Learn Other Site Address* (City, State) Message F: 301-682-3391 QUICK LINKS Products Manufacturers Engineering Parts Contact About NEWS MTH Pumps Introduces the T31 Pump in 3-Phase Open Drip Proof April 13, 2021 One Small Box Saves the Day December 2, 2020 Grundfos Hydro MPC HVAC System Solves Contractor and Engineer Challenges and is named 2020 Product of the Year Award Winner by Engineered Systems. October 9, 2020 CONTACT US 97 Monocacy Blvd Suite D Frederick, MD 21701 P: (301) 682-3390 T: (800) 233-7718 F: (301) 682-3391 Copyright ©2021 STH Inc. All Rights Reserved. Privacy Policy. Designed by ArachnidWorks, Inc.