Additional Drilling Equipment - johnnytwo-tone Store For Sale Is: Southwest Oilfield Products 105-4A Duplex Mud Pump Piston 6" API-4. This item is new, in its original box. I have no way of testing this, but I will guarantee this item fully functional or I will refund your payments along with the initial shipping costs. GAR International Buyers - Please Note:Import duties, taxes and charges are not included in the item price or shipping charges. Buyers are responsible for these charges.Please check with your country's customs office to determine what these additional costs will be prior to bidding/buying. Location: Citrus Heights, California. For complete listing information please select the Click To Bid button to see this item on eBay.