{"product_id":"castair-1-1-4-inlet-60-cfm-6-75o-d-x7-0o-a-ht-complete-air-filter-assembly-and-element-s-20dp-125","title":"Castair 1 1\/4\" Inlet 60 CFM 6.75\"O.D.x7.0\"O.A.Ht. Complete Air Filter Assembly and Element S-20DP-125","description":"\u003ch2\u003eCastair S-20DP-125 Complete Air Filter Assembly — 1-1\/4” Inlet, 60 CFM, Dual Foam Pre-Filter, Silencer Type\u003c\/h2\u003e\n\n\u003cp\u003eThe Castair S-20DP-125 is the factory intake air filter for high-output cast iron compressor pumps with a 1-1\/4” NPT inlet, rated at 60 CFM. The \"DP\" construction means dual pre-filter — a foam pre-filter ahead of the primary element extends service life in dusty shop conditions. The body is 6.75” outer diameter and 7.0” overall height, sized to handle the full displacement of 10–15 HP pump configurations running 1-1\/4” NPT inlet ports.\u003c\/p\u003e\n\n\u003cp\u003eThe 1-1\/4” inlet size is a common specification on Castair mid-to-large cast iron pumps. The S-20DP-100 uses the same body with a 1” NPT inlet, and the S-20DP-150 uses it with a 1-1\/2” NPT inlet. Confirm your pump inlet thread size before ordering — these three models look identical but will not interchange.\u003c\/p\u003e\n\n\u003ch3\u003eWhat the S-20DP-125 Does\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-stage filtration:\u003c\/strong\u003e Foam pre-filter plus primary 20DP element. Pre-filter catches coarse debris before it loads the primary element, extending element life in harsh shop environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilencer construction:\u003c\/strong\u003e Attenuates intake noise from the pump valve cycling. On a slow-RPM cast iron pump this is a meaningful noise reduction in the shop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete assembly:\u003c\/strong\u003e Ships with the 20DP element and foam pre-filter installed. No additional sourcing required for first installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSized for 60 CFM:\u003c\/strong\u003e Correct for 10–15 HP pump configurations. Using a filter rated below the pump displacement will restrict airflow and reduce pump performance and service life.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e S-20DP-125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair, Inc. (Spicer, MN)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Connection:\u003c\/strong\u003e 1-1\/4” NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 6.75”\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Height:\u003c\/strong\u003e 7.0”\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlow Rating:\u003c\/strong\u003e 60 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Silencer-type, dual pre-filter construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Element:\u003c\/strong\u003e 20DP (ID 3”, OD 4-3\/8”, Height 4-3\/4”) with foam pre-filter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCastair cast iron pumps with 1-1\/4” NPT inlet connections rated up to 60 CFM displacement\u003c\/li\u003e\n\u003cli\u003eCastair 10–15 HP industrial and commercial compressor configurations\u003c\/li\u003e\n\u003cli\u003eAny reciprocating compressor pump with a 1-1\/4” NPT inlet displacing up to 60 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eReplacement Element: 20DP\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElement Part Number:\u003c\/strong\u003e 20DP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 3”\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4-3\/8”\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 4-3\/4”\u003c\/li\u003e\n\u003cli\u003eThe 20DP element includes an integrated foam pre-filter. Do not substitute a 16D element — it is shorter and will not seat correctly in the 20DP body.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Configurations — Castair Air Filter Lineup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS-20DP-100\u003c\/strong\u003e — 1” inlet, 6.75” OD x 7.0” height, 60 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS-20DP-125\u003c\/strong\u003e — 1-1\/4” inlet, 6.75” OD x 7.0” height, 60 CFM (this unit — $71.61)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS-20DP-150\u003c\/strong\u003e — 1-1\/2” inlet, 6.75” OD x 7.0” height, 60 CFM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS-32DP-200\u003c\/strong\u003e — 2” inlet, 7.5” OD x 7.5” height, 195 CFM\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen Does a Shop Need the S-20DP-125 vs. Stepping Up or Down?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder the S-20DP-125\u003c\/strong\u003e if your pump has a 1-1\/4” NPT inlet and displaces up to 60 CFM. This is the correct thread size for this body.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompare with S-20DP-100 and S-20DP-150:\u003c\/strong\u003e All three use the same body and element at the same price. The only difference is inlet thread: 1” (S-20DP-100), 1-1\/4” (S-20DP-125), 1-1\/2” (S-20DP-150). Measure your pump inlet before ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to S-32DP-200\u003c\/strong\u003e for 20+ HP pumps with 2” NPT inlets and up to 195 CFM. The S-20DP series body is not rated for that volume.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Castair S-20DP-125 complete air filter assembly (silencer type), 1-1\/4” NPT inlet\u003c\/li\u003e\n\u003cli\u003e1x 20DP filter element with foam pre-filter (pre-installed)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine Castair OEM components\u003c\/strong\u003e — built to fit Castair pumps exactly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support at 866-217-0063\u003c\/strong\u003e — thread size questions are common; we help you get the right part before ordering\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e20DP replacement elements in stock\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\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":53342598037717,"sku":"S-20DP-125","price":132.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/air-filter-kit_09351097-2baf-43cc-843e-589b3e890d0e.jpg?v=1772652885","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-1-1-4-inlet-60-cfm-6-75o-d-x7-0o-a-ht-complete-air-filter-assembly-and-element-s-20dp-125","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}