D21 Spark Plug


$2.99 EA

It is important to replace worn spark plugs for the safety of your engines. This D21 spark plug has Copper Plus® technology which offers excellent conductivity and heat control. Ideal for a variety of automotive, lawn and garden machinery, or other applicable engines.

Availability: In Stock -

A great addition to your mechanical or automotive engines. This Champion spark plug has a thread diameter of 3/4 in., a reach of 1/2 in., and a hex size of 7/8 in. The Copper Plus® technology consists of having a copper extrusion flow through the center electrode. This allows for improved conductivity and a better heat range and control of heat throughout each use. The nickel alloy center provides this engine spark plug with protection against wear.

  • Champion Spark Plug
  • Champion Copper Plus® technology
  • Copper extrusion into center electrode
  • Nickel alloy center
  • Increased conductivity
  • Excellent heat range and control
  • Thread diameter: 3/4 in.
  • Thread reach: 1/2 in.
  • Hex: 7/8 in.

Shipping Information

Your order is important to us and we will strive to process it as quickly as possible. Most in-stock items are shipped within 2-4 business days and typically deliver in 5-7 business days. In-stock items may ship from multiple locations and can arrive on separate days. Heavy or bulky items will ship via Freight/Truck Service and will take 8-10 business days for delivery. For those immediate product needs, we do offer at an additional cost, express service from UPS and Motor freight.

Shipping costs are determined by item weight and your zipcode. Once you have entered your shipping address, city, state, and zip code into checkout, your shipping total will be calculated and available for review. Please see the shipping map below as a guide.

Return Information

Your satisfaction is our priority. If for any reason you are not satisfied with a purchase from Agri Supply, we will gladly refund your money, or exchange the item, or fix it should it break. A minimum one-year warranty applies to all non-perishable items, parts and service from Agri Supply. And, all hand tools sold by Agri Supply have a lifetime warranty, regardless of the length of the manufacturer's warranty. See our Agri Supply Guarantee for more details.

To return an item... give us a call at 1-800-345-0169, or visit one of our 8 retail stores near you, and one of our friendly customer service representatives, or store employees, will be glad to assist you.

If you have any questions please contact our Customer Service representatives at 1-800-345-0169

Standard UPS Ground Shipping Map -
UPS Ground
The above shipping chart applies to UPS ground shipments to the 48 contiguous states only. Please call 1-800-345-0169 for timing on shipments to Alaska, Hawaii, and Puerto Rico, thank you!

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