Return Policy

At United Engine & Machine Co., customer satisfaction is our priority. If you are not completely satisfied with your purchase, you may return it under the following conditions:

Eligibility for Returns

  • Items must be returned within 30 days of receipt.
  • Products must be complete, in new, uninstalled condition, and in original packaging.
  • Special Order, obsolete, legacy, single piston and clearance items are non-returnable.
  • All returns must be accompanied by an RGA number.

Return Process

  • Contact our customer service team at or 1-800-648-7970 to initiate a return.
  • Provide your order number, reason for return, and whether you prefer a refund or exchange.
  • You will receive a Return Goods Authorization (RGA) number which must be included with your return.


  • Return shipments must be packaged sufficiently to prevent damage.
  • Customers are responsible for return shipping costs and tracking.
    • Return Address;
      United Engine & Machine Co. / Attn: Returns
      217 Third Street
      Douglas, AZ 85607


  • Returns are subject to a 15% handling fee.
  • Refunds will be processed to the original payment method within 10 business days of receiving the return.
  • Shipping costs are non-refundable.

Damaged or Defective Items

  • If you receive a damaged or defective item, contact us immediately.
  • We will arrange for a replacement or refund, and cover return shipping costs.

Stocking Distributor Annual Return

  • All above guidelines and processes apply.
  • Applicable for purchases made in the previous two years only.
  • Allowance for up to 3% of the previous year total volume.
  • Requires an accompanying equivalent offsetting order.

For any questions or concerns about our return policy, please contact us at or 1-800-648-7970


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