{"product_id":"castair-replacement-air-filter-element-for-s-16d-100-assembly-c1-c2-c3u-pumps-3-id-x4-3-8od-16dp","title":"Castair Replacement Air Filter Element For S-16D-100 Assembly C1,C2, C3U Pumps 3\" ID.X4 3\/8\"OD. 16DP","description":"\u003cp\u003eThe Castair 16DP is a replacement air filter element for the S-16D-100 assembly used on C1, C2, and C3U pumps. This filter element fits the 1\" inlet silencer\/filter housing and is designed for Castair's larger industrial two-stage compressor pumps. At $10.01, this is a maintenance item — one you should have on hand before you need it, because a clogged or missing intake filter kills pump efficiency and shortens pump life. The 16DP element has a foam pre-filter in addition to the main element, which is the distinction from the standard 16D element.\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 16DP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Assembly:\u003c\/strong\u003e S-16D-100 (1\" inlet silencer\/filter assembly)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Pumps:\u003c\/strong\u003e C1, C2, C3U (and VA80 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 Yes — foam pre-filter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $10.01 per element\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhich Filter Do You Need: 16D vs. 16DP?\u003c\/h2\u003e\n\u003cp\u003eBoth the 16D and 16DP share the same physical dimensions — 3\" ID, 4-3\/8\" OD, 2-1\/8\" height. The difference is which assembly they go into and which pumps they serve:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e16D ($7.70):\u003c\/strong\u003e Fits the S-16D-075 assembly (3\/4\" inlet). Used on A4 and A8 pumps (smaller single-stage pumps, 3.5-5 HP range)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16DP ($10.01):\u003c\/strong\u003e Fits the S-16D-100 assembly (1\" inlet). Used on C1, C2, C3U pumps — the larger two-stage pumps used in 4-15 HP industrial compressors. Also comes with the foam pre-filter for additional particulate protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you are not sure which pump you have, look at the pump casting or your original compressor spec sheet. C1 pumps are 4-7.5 HP, C2 pumps are 7.5-10 HP, and C3U pumps are used in some 15 HP configurations. All three use the 16DP element.\u003c\/p\u003e\n\n\u003ch3\u003eThe Foam Pre-Filter\u003c\/h3\u003e\n\u003cp\u003eThe 16DP, 20DP, and 32DP filter elements all include a foam pre-filter. The foam layer catches larger particles before they reach the main paper element, extending service life between changes. In a dusty shop environment, the foam pre-filter can be inspected and cleaned separately during regular maintenance without replacing the entire element.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Intake Filtration Matters\u003c\/h2\u003e\n\u003cp\u003eThe intake air filter does two jobs: it removes particulates from the air entering the pump cylinders, and the silencer housing attenuates intake noise. A clogged filter restricts airflow, which means the pump works harder to move the same volume of air — higher temperatures, more wear, and lower output. On a cast iron industrial pump like the C1 or C2, replacement pump costs run into the hundreds or thousands of dollars. A $10 filter element is cheap insurance.\u003c\/p\u003e\n\n\u003ch3\u003eReplacement Interval\u003c\/h3\u003e\n\u003cp\u003eCastair does not publish a specific interval — it depends on the air quality in your shop. Inspect the element every oil change (every 1,000 hours or annually). In a dirty environment (welding shop, woodworking, dusty concrete floors), inspect monthly. Replace when the element is visibly dirty or when you notice decreased output pressure.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x Castair 16DP replacement filter element with foam pre-filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: Filter housing (S-16D-100 assembly) sold separately. The element slips into the existing housing — no tools required for element replacement in most applications.\u003c\/p\u003e\n\n\u003ch2\u003eCompatible Right From The Start Kits\u003c\/h2\u003e\n\u003cp\u003eCastair's RFS001 and RFS002 start-up kits include two 16D elements per kit (two filters, one per pump side or two for duplex). The 16DP is the element for the 1\" inlet assembly — if your Right From The Start kit called for 16D but you have a C1\/C2\/C3U pump, verify with your pump model which element is correct. Call us at 866-217-0063 if you are unsure.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h2\u003e\n\u003cp\u003eWe have been specializing in industrial air compressor components since 2016. We stock Castair replacement parts including filter elements, oil, belts, and hardware — the maintenance items that keep your system running. Free shipping on all orders, 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":53342500618453,"sku":"16DP","price":18.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/360_F_473254957_bxG9yf4ly7OBO5I0O5KABlN930GwaMQz_cca3decd-5304-4c8f-8269-00a382a83bcc.jpg?v=1772652448","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-replacement-air-filter-element-for-s-16d-100-assembly-c1-c2-c3u-pumps-3-id-x4-3-8od-16dp","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}