# MadMax Trade Supply

> Reseller of replacement parts, job supplies and recurring home-maintenance consumables for contractors and homeowners (air and water filters, HVAC and plumbing repair parts, septic and sump parts, radon supplies, batteries, lighting, alarms, pool and vacuum filters, electrical and job-site supplies, roofing accessories). DBA of MadMax Enterprises, LLC, 5424 Kellogg Ave, Edina, MN 55424, USA.

Status: 418 items have published USD prices (see catalog.json `priced_items`, and Product/Offer JSON-LD on each category page). Prices are break-even: they include the sales tax we pay at purchase and, unless `shipping_included` is false, shipping; no tax is added at checkout. Customers order at https://www.madmaxsupply.com/cart/ and receive a secure payment link by email before anything ships. Other items are quote-only. Prices verified 2026-11-14.

Terms, shipping and returns: https://www.madmaxsupply.com/terms/

Request a quote: https://www.madmaxsupply.com/quote/ or taylor@madmaxsupply.com.

## Categories
- [HVAC Repair Parts](https://www.madmaxsupply.com/hvac-repair-parts/): Capacitors, contactors, thermostats and condensate pumps, quoted by rating or model. (for: contractor; quote only)
- [Plumbing & Water Heater Parts](https://www.madmaxsupply.com/plumbing-parts/): Water-heater valves and elements, expansion tanks, stops, traps and repair fittings. (for: contractor; quote only)
- [Electrical Basics](https://www.madmaxsupply.com/electrical-basics/): Breakers, GFCI devices, switches, receptacles, boxes and connectors, matched to the panel or device type. (for: contractor; quote only)
- [Job-Site Consumables & PPE](https://www.madmaxsupply.com/jobsite-ppe/): Gloves, safety glasses, tape, sealants, fasteners and marking paint for the job site. (for: contractor; quote only)
- [Radon Mitigation Supplies](https://www.madmaxsupply.com/radon-mitigation/): Mitigation fans, vent pipe, manometers and radon test kits, matched by model or pipe size. (for: contractor, homeowner; 40 priced items from $9.30)
- [Septic & Wastewater Parts](https://www.madmaxsupply.com/septic-parts/): Alarms, floats, effluent filters, risers and lids, aerobic air pumps, UV bulbs and more. (for: contractor, homeowner; 20 priced items from $120.28)
- [Sump & Effluent Pumps & Alarms](https://www.madmaxsupply.com/sump-pumps/): Sump and effluent pumps, backup pumps, high-water alarms, floats and check valves. (for: contractor, homeowner; 30 priced items from $8.84)
- [Roofing Accessories](https://www.madmaxsupply.com/roofing-accessories/): Pipe boots, roof vents and related flashings, quoted by pipe size and roof pitch. (for: contractor; quote only)
- [HVAC Air Filters](https://www.madmaxsupply.com/hvac-air-filters/): Furnace and AC air filters by nominal size and MERV rating. (for: contractor, homeowner; 36 priced items from $47.06)
- [Refrigerator Water Filters](https://www.madmaxsupply.com/refrigerator-water-filters/): Replacement fridge water filters matched by refrigerator model or filter part number. (for: contractor, homeowner; 88 priced items from $10.21)
- [Under-Sink, RO & Whole-House Filters](https://www.madmaxsupply.com/water-filter-cartridges/): Under-sink, reverse-osmosis and whole-house cartridges and membranes, matched by system model or size. (for: homeowner; 60 priced items from $15.26)
- [Humidifier Pads & Wicks](https://www.madmaxsupply.com/humidifier-pads/): Whole-house and portable humidifier water panels, pads and wicks, matched by model or size. (for: contractor, homeowner; 7 priced items from $36.09)
- [Air Purifier & HEPA Filters](https://www.madmaxsupply.com/hepa-purifier-filters/): HEPA, carbon and pre-filters for room air purifiers and dehumidifiers, matched by model. (for: homeowner; quote only)
- [Batteries](https://www.madmaxsupply.com/batteries/): Household, coin-cell and hearing-aid batteries for alarms, remotes and devices. (for: contractor, homeowner; 24 priced items from $9.82)
- [LED Light Bulbs](https://www.madmaxsupply.com/led-light-bulbs/): LED bulbs by base, shape, color temperature and output, for homes and job sites. (for: contractor, homeowner; 45 priced items from $8.57)
- [Smoke & CO Alarms](https://www.madmaxsupply.com/smoke-co-alarms/): Smoke and carbon monoxide alarms, plus replacement batteries, for homes and job close-outs. (for: contractor, homeowner; quote only)
- [Pool & Spa Filter Cartridges](https://www.madmaxsupply.com/pool-spa-filters/): Pool and spa filter cartridges and baskets, matched by filter or pump model. (for: homeowner; 68 priced items from $33.32)
- [Vacuum Filters & Bags](https://www.madmaxsupply.com/vacuum-filters/): Vacuum bags, HEPA filters and foam filters, matched by vacuum model. (for: homeowner; quote only)
- [Range Hood Filters](https://www.madmaxsupply.com/range-hood-filters/): Mesh, baffle and charcoal range-hood filters, matched by hood model or size. (for: homeowner, contractor; quote only)

## Lookups and data
- [Air filter size lookup](https://www.madmaxsupply.com/lookup/filter-size/): nominal size -> items (data: https://www.madmaxsupply.com/data/filter-sizes.json)
- [Refrigerator model lookup](https://www.madmaxsupply.com/lookup/fridge-model/): model -> filter (data: https://www.madmaxsupply.com/data/fridge-models.json; empty until model data is loaded)
- [Full catalog JSON](https://www.madmaxsupply.com/data/catalog.json)
- [Product feed, Google Merchant RSS 2.0 XML](https://www.madmaxsupply.com/feeds/google-merchant.xml): 418 priced, in-stock items (also at /feeds/products.xml)
- [Product feed, Bing tab-separated](https://www.madmaxsupply.com/feeds/bing.tsv): same items

## Buying guides
- [All guides](https://www.madmaxsupply.com/guides/)
- [How to choose an HVAC air filter MERV rating](https://www.madmaxsupply.com/guides/hvac-filter-merv-rating/): What MERV means, how to read your filter size, and how to balance filtration with airflow when picking a furnace or AC filter.
- [How often to replace a refrigerator water filter](https://www.madmaxsupply.com/guides/refrigerator-water-filter-replacement/): Typical replacement interval for refrigerator water filters, how to find the right part number, and signs it is time to change the filter.
- [Which battery does a smoke or CO alarm take?](https://www.madmaxsupply.com/guides/smoke-co-alarm-batteries/): How to identify the right replacement battery for a smoke or carbon monoxide alarm, plus testing and replacement reminders.
- [Septic effluent filter and alarm basics](https://www.madmaxsupply.com/guides/septic-effluent-filter-basics/): What a septic tank effluent filter does, general maintenance practice, and how high-water alarms help protect a pump tank or drainfield.
- [Whole-house humidifier pad replacement](https://www.madmaxsupply.com/guides/humidifier-pad-replacement/): How to find the right humidifier water panel or pad number and how often to replace it.

## Company
- [About](https://www.madmaxsupply.com/about/)
- Contact: taylor@madmaxsupply.com