Castair S-16D-050

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Castair S-16D-050 Complete Air Filter Assembly — 1/2” Inlet, 20 CFM, Silencer Type

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The Castair S-16D-050 is the factory-spec intake air filter assembly for reciprocating air compressor pumps with a 1/2” NPT inlet. It is a silencer-type unit — handling both air filtration and intake noise attenuation in a single component. The assembly ships complete with the filter element already installed, rated for up to 20 CFM of airflow. At 6.75” outer diameter and 4.5” overall height, this filter fits Castair A4-series cast iron pumps and any comparable pump with a 1/2” NPT inlet port.

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Castair, Inc. has been manufacturing cast iron air compressor pumps and systems in Spicer, Minnesota since 1991. When they equip their own compressors, this is the filter they use. The S-16D-050 is not a generic replacement — it is the OEM component matched to their pump line. If your pump is running a 1/2” NPT inlet, this is the correct part number.

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What the S-16D-050 Does

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  • Filters intake air: Keeps airborne dust, particulates, and shop debris out of the compression chamber. Contaminated intake air accelerates cylinder wear, ring wear, and valve deterioration.
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  • Silences intake noise: The "S" prefix indicates silencer-type construction. The filter body attenuates the characteristic intake pulsation noise from the pump valve cycling.
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  • Ships as a complete assembly: The 16D element is pre-installed. No separate element sourcing required for initial use.
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  • Matched to pump CFM: Rated at 20 CFM, which aligns with 5 HP cast iron pump displacement. An undersized filter creates inlet restriction and robs pump efficiency.
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Technical Specifications

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  • Part Number: S-16D-050
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  • Manufacturer: Castair, Inc. (Spicer, MN)
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  • Inlet Connection: 1/2” NPT
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  • Outer Diameter: 6.75”
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  • Overall Height: 4.5”
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  • Flow Rating: 20 CFM
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  • Type: Silencer-type complete assembly with element
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  • Replacement Element: 16D (ID 3”, OD 4-3/8”, Height 2-1/8”)
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Compatible Applications

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  • Castair A4-series cast iron pump with 1/2” NPT inlet
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  • Castair industrial series compressors rated 5 HP (I5xx models)
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  • Any reciprocating compressor pump with a 1/2” NPT inlet connection displacing up to 20 CFM
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Replacement Element: 16D

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  • Element Part Number: 16D
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  • Inner Diameter: 3”
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  • Outer Diameter: 4-3/8”
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  • Height: 2-1/8”
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  • The 16DP, 20DP, and 32DP series filters include foam pre-filters; the S-16D-050 uses the standard 16D element.
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Available Configurations — Castair Air Filter Lineup

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  • S-16D-050 — 1/2” inlet, 6.75” OD x 4.5” height, 20 CFM (this unit)
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  • S-16D-075 — 3/4” inlet, 6.75” OD x 4.5” height, 20 CFM
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  • S-16D-100 — 1” inlet, 6.75” OD x 4.5” height, 30 CFM
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  • S-20DP-100 — 1” inlet, 6.75” OD x 7.0” height, 60 CFM (dual pre-filter body)
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  • S-20DP-125 — 1-1/4” inlet, 6.75” OD x 7.0” height, 60 CFM
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  • S-20DP-150 — 1-1/2” inlet, 6.75” OD x 7.0” height, 60 CFM
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  • S-32DP-200 — 2” inlet, 7.5” OD x 7.5” height, 195 CFM
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When Does a Shop Need the S-16D-050 vs. Stepping Up?

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  • Order the S-16D-050 when your pump has a 1/2” NPT inlet and displaces up to 20 CFM. Typically 5 HP and under.
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  • Step up to S-16D-075 if your pump inlet is 3/4” NPT. Same body, different thread.
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  • Step up to S-16D-100 for 7.5–10 HP pumps with a 1” NPT inlet and up to 30 CFM.
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  • Step up to S-20DP series for 10–15 HP pumps displacing up to 60 CFM with 1”, 1-1/4”, or 1-1/2” inlets.
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  • Step up to S-32DP-200 for 20–30 HP pumps with 2” inlets and up to 195 CFM.
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Inlet port thread size is the primary selection criterion. Measure the pump inlet port before ordering.

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What’s in the Box

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  • 1x Castair S-16D-050 air filter assembly (silencer type), 1/2” NPT inlet
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  • 1x 16D filter element (pre-installed inside assembly)
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Why Buy From Air Compressor Factory Direct?

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  • Genuine Castair OEM components — the same part that came on your compressor from the factory
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  • Free shipping on qualifying orders
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  • Free technical support — call 866-217-0063 if you are unsure which filter size fits your pump
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  • Full manufacturer warranty on all Castair components
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  • Honest guidance — if you are cross-referencing a non-Castair pump, we can help you determine the right fit before you order
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Call 866-217-0063 for quick answers and help!