{"product_id":"castair-replacement-air-filter-element-for-s-16d-075-assembly-a4-a8-pump-3-id-x4-3-8od-16d","title":"Castair Replacement Air Filter Element For S-16D-075 Assembly A4\/A8 Pump 3\" ID.X4 3\/8OD. 16D","description":"\u003cp\u003eThe Castair 16D is a replacement air filter element for the S-16D-075 assembly, designed for Castair A4 and A8 series compressor pumps. This is a standard maintenance item for single-stage industrial Castair compressors in the 3.5-5 HP range. At $7.70 per element, it is one of the lowest-cost maintenance items in the Castair system — and one of the more important ones. Running with a dirty or missing intake filter restricts airflow and accelerates pump wear.\u003c\/p\u003e\n\n\u003ch2\u003eFilter Element Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 16D\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Assembly:\u003c\/strong\u003e S-16D-075 (3\/4\" inlet silencer\/filter assembly)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Pumps:\u003c\/strong\u003e A4 and A8 series (also fits S-16D-100 assembly per filter chart)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4-3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 2-1\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-filter:\u003c\/strong\u003e No — standard element without foam pre-filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $7.70 per element\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e16D vs. 16DP: Choosing the Right Element\u003c\/h2\u003e\n\u003cp\u003eBoth elements have identical physical dimensions — 3\" ID, 4-3\/8\" OD, 2-1\/8\" height. The key differences:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16D ($7.70):\u003c\/strong\u003e Fits S-16D-075 (3\/4\" inlet assembly). Used on A4\/A8 pumps (single-stage, 3.5-5 HP). No foam pre-filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16DP ($10.01):\u003c\/strong\u003e Fits S-16D-100 (1\" inlet assembly). Used on C1, C2, C3U pumps (two-stage, 4-15 HP). Includes foam pre-filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 16D is for smaller single-stage pumps; the 16DP is for larger two-stage pumps. Ordering the wrong element is a common mistake — confirm your pump model before ordering. The A4 and A8 are single-stage, V-twin configuration pumps in the 3.5-5 HP range used in Castair commercial and some industrial units.\u003c\/p\u003e\n\n\u003ch3\u003eAbout the A4 and A8 Pumps\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eA4:\u003c\/strong\u003e Single-stage pump in the 3.5-5 HP class, used in Castair commercial-series compressors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA8:\u003c\/strong\u003e Similar single-stage pump, higher CFM variant — the VA80 designation in Castair's pump lineup (3.5-5 HP, 110 lbs, single-stage)\u003c\/li\u003e\n\u003cli\u003eBoth pumps use a 3\/4\" inlet, which matches the S-16D-075 assembly that takes the 16D element\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Intake Air Filtration Matters\u003c\/h2\u003e\n\u003cp\u003eThe intake filter removes airborne particulates before they enter the pump cylinders. Fine dust, metal particles, and shop debris are abrasive inside pump cylinders and on valve seats. A clean filter means cleaner air going in and less wear on internal pump components. Beyond protecting the pump, the silencer housing also reduces intake noise — a secondary benefit that makes the compressor quieter during operation. Both functions degrade when the filter element is clogged or missing.\u003c\/p\u003e\n\n\u003ch3\u003eMaintenance Schedule\u003c\/h3\u003e\n\u003cp\u003eInspect the 16D element every oil change. In clean environments, annual replacement is typically sufficient. In dusty shops, inspect every 3 months and replace when visibly dirty. The element cannot be cleaned with compressed air (paper media) — replace it when dirty.\u003c\/p\u003e\n\n\u003ch2\u003eCastair Right From The Start Kits\u003c\/h2\u003e\n\u003cp\u003eThe Castair RFS001 and RFS002 start-up kits include two 16D elements per kit. If you bought your compressor with a Right From The Start kit, those were your initial elements. Replacement 16D elements are ordered individually or in any quantity from us.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Castair 16D replacement air filter element\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: The S-16D-075 filter housing is sold separately. Element replacement requires no special tools in most applications — remove the housing cap, pull the old element, insert the new one, reinstall the cap.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe carry the full range of Castair replacement parts and maintenance supplies. Filter elements ship fast and free. If you are building a maintenance kit for a Castair compressor, call us — we can put together everything you need (oil, filters, belts) in one order. Free shipping, free technical support at 866-217-0063, and full manufacturer warranty on all Castair parts.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342500192469,"sku":"16D","price":14.2,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/360_F_473254957_bxG9yf4ly7OBO5I0O5KABlN930GwaMQz_01dc4aba-e097-4bbe-8fb4-eac9c5da4247.jpg?v=1772652446","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-replacement-air-filter-element-for-s-16d-075-assembly-a4-a8-pump-3-id-x4-3-8od-16d","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}