{"product_id":"airdog-ws100-ff100-2-replacement-pre-filter-and-fuel-filter-combo-pack-fits-airdog-ii-ii-4g-water-separating","title":"AirDog WS100 \u0026 FF100-2 Replacement Pre-Filter and Fuel Filter Combo Pack — Fits AirDog\/II\/II-4G, Water-Separating","description":"\u003cp\u003e\u003cstrong\u003eAirDog Pre-Filter WS100 and Fuel Filter FF100-2 Combo Pack are replacement water separator and fuel filter elements designed to restore fuel flow and moisture protection for AirDog fuel filtration systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese Pureflow replacement elements fit AirDog, AirDog II and AirDog II-4G systems and are made to remove water and particulate that reduce diesel fuel pressure and injector performance. Regularly replacing the pre-filter (WS100) and the fuel filter (FF100-2) keeps the filtration system operating at peak capacity and reduces the risk of clogged lines, stalled injectors, and reduced engine responsiveness. This listing includes the filter elements only and does not include the full AirDog pump assembly.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these replacement filters improve diesel fuel flow?\u003c\/h3\u003e\n\u003cp\u003eThe WS100 pre-filter captures free water while the FF100-2 fuel filter traps fine particulates and contaminants before they reach the engine. Replacing both at recommended intervals prevents pressure drops and restores consistent fuel delivery to the injection system.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWS100 removes separated water to prevent corrosion and microbial growth.\u003c\/li\u003e\n  \u003cli\u003eFF100-2 captures soot, rust, and dirt to protect injectors and pumps.\u003c\/li\u003e\n  \u003cli\u003eNew elements help maintain factory flow rates and pressure stability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen should I change the pre-filter and fuel filter?\u003c\/h3\u003e\n\u003cp\u003eReplacement frequency depends on fuel quality and operating hours, but inspect filters during routine service intervals or if you notice lower fuel pressure. As a general practice, change filters at the first sign of reduced engine performance, increased fuel pump noise, or visible contamination in the filter housing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck seals and elements during scheduled maintenance or every few thousand miles\/hours.\u003c\/li\u003e\n  \u003cli\u003eReplace immediately after discovering water or heavy sediment in the system.\u003c\/li\u003e\n  \u003cli\u003eFollow vehicle or equipment manufacturer recommendations for interval guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these parts compatible with my AirDog model?\u003c\/h3\u003e\n\u003cp\u003eYes — these Pureflow WS100 and FF100-2 elements are designed to fit AirDog, AirDog II and AirDog II-4G filtration units. They are intended as direct replacements for the original water separator and fuel filter elements in those systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit replacements for AirDog, AirDog II, and AirDog II-4G series.\u003c\/li\u003e\n  \u003cli\u003eSold as filter elements only; pump housings and fittings are not included.\u003c\/li\u003e\n  \u003cli\u003eVerify part numbers against your system manual before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect during installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eInstalling the WS100 and FF100-2 elements is a straightforward service task for most technicians and experienced DIYers familiar with fuel systems. Use clean tools, replace O-rings if worn, and prime the system after installation to remove trapped air.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDrain water from the separator before element removal to avoid spills.\u003c\/li\u003e\n  \u003cli\u003eReplace associated seals and tighten to manufacturer torque specs.\u003c\/li\u003e\n  \u003cli\u003ePrime the AirDog pump per instructions to restore proper fuel flow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This combo pack is aimed at diesel vehicle owners, fleet managers, and marine or industrial operators running AirDog filtration systems who want to maintain reliable fuel delivery and protect injectors and pumps. Choose this set when you need proven replacement elements that restore moisture separation and particulate filtration without replacing the entire pump, especially if you run varied fuel sources or operate in humid or contaminated-fuel environments.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFuel Type: Diesel\u003c\/li\u003e\n  \u003cli\u003eIncludes: AirDog-compatible water separator (WS100) and fuel filter (FF100-2) replacement elements\u003c\/li\u003e\n  \u003cli\u003eNote: This listing is for replacement elements only — does NOT include the AirDog pump or full fuel system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these filters fit AirDog II-4G?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The WS100 and FF100-2 are compatible replacement elements for AirDog, AirDog II, and AirDog II-4G systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit include the AirDog pump?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This listing contains only the replacement water separator and fuel filter elements, not the pump or housing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"AirDog","offers":[{"title":"Default Title","offer_id":48081065803934,"sku":"B01MY04KCV","price":94.93,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/airdog-front-packaging-ws100-ff100-2.jpg?v=1785795785","url":"https:\/\/northtrailauto.ca\/products\/airdog-ws100-ff100-2-replacement-pre-filter-and-fuel-filter-combo-pack-fits-airdog-ii-ii-4g-water-separating","provider":"North Trail Auto","version":"1.0","type":"link"}