CORE & MAIN SUPPLY
YOUR ONE-STOP SHOP FOR WATER AND WASTEWATER TREATMENT PRODUCTS IN THE LAB, PLANT AND FIELD.
From big projects to everyday maintenance, repair and operations, we provide convenient and fast access to thousands of in-stock items shipped directly to your facility.
Thousands of products from the brands you trust
Free shipping on qualifying orders*
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Browse Featured Products
Maintain efficient wastewater operations with high-quality aeration equipment, blowers, lubricants, and filters that enhance basin and system performance.
Optimize treatment efficiency and water quality with bioaugmentation, digestants, and process chemicals for reliable system performance.
Track, record, and verify system performance with industrial-grade chart recorders designed for water and wastewater applications
Deliver precise chemical dosing with durable pumps, fittings, and maintenance kits designed for dependable municipal plant operation.
Find chlorination and dechlorination chemicals, feeders, and diffusers for safe, effective water treatment processes.
Prevent blockages and extend system life with maintenance and repair tools for reliable collection system performance.
Manage stormwater and protect water systems with durable, environmentally responsible construction products.
Auto Dialers, Portable Power and Lighting for municipal water and professional contractors.
Accurately measure and monitor flow with dependable in-line and open-channel metering equipment for treatment facilities.
Ensure accurate pressure monitoring in municipal and industrial systems with reliable, high-quality gauges and accessories.
Move and transfer water safely with durable suction, discharge, and specialty hoses built for tough wastewater applications.
Keep hydrants functional and lines clean with a complete range of hydrant tools and maintenance accessories.
Achieve accurate, repeatable water testing results with quality lab reagents, standards, and chemicals.
Equip your lab for compliance and precision with trusted water testing instruments and essential supplies.
Select from high-quality instrumentation, test kits and supplies for measuring pH, chlorine, turbidity, dissolved oxygen, fluoride, ammonia and more.
Maintain system accuracy with dependable level and pressure transmitters, floats, and alarms for water operations.
Find leaks and locate utilities quickly with our high-quality leak detection systems & products.
Rely on McElroy’s industry-leading HDPE fusion equipment and accessories for efficient pipe joining.
Ensure you have the best tools for cutting, tapping, joining, or repairing your pipes with our vast selection of Pipe Tools & Accessories.
Plugs and plug accessories ensure easy pipe blocking during repair, leak testing, or maintenance operations for water and sewer pipes.
Continuously monitor key water-quality parameters with advanced process analyzers for compliance and control.
Move water, wastewater, and sludge efficiently with a full range of centrifugal, submersible, and positive-displacement pumps.
Protect crews and facilities with a complete selection of PPE, confined-space, and traffic safety equipment.
Collect and preserve water samples securely with specialized containers, bottles, and transport supplies.
Durable, High-Performance Tanks for Municipal Water Systems. Engineered for long-term reliability and compliance for chemical storage, water treatment and distribution.
Keep your plant running smoothly with reliable, purpose-built tools for maintenance, repair, and daily operations.
*$1500 applies to lower 48 states. $4500 minimum required for free shipping to Alaska and Hawaii.