421-1112 Pump New Style After Letter G KU Series Air Compressor Pump Assembly

The 421-1112 air compressor pump is a blue Jenny air pump that can be used on most Jenny air compressor models.

This 421-1112 Jenny air pump features a pre-equipped flywheel, air intake filter assembly, and unloader valve.

With the built-in unloader, the 421-1112 air pump supports constant-use applications, such as constant-use air compressors.

Air compressor pump 421-1112 is compatible with 5, 5.5, 6, and 6.5 HP gas air compressors. This pump also supports 1 to 2 HP electric air compressors as well.

Service Notice

This air compressor pump may have different variations depending on the when the pump was manufactured. This will be reflected in the serial number on the pump.

The 421-1112 is the new style blue Jenny air compressor pump. This version has a slightly larger crankcase, which can cause issues with belt guard mounting on an air compressor that used the old style.

Check Your Pump's Serial Number Before Ordering

We always recommend checking your pump's serial number before ordering a replacement. For assistance or questions regarding which style of this pump you need to order, our customer service team is always ready to assist.

• If the serial number begins with a "G", then your pump is the 421-1112 new style pump.
• If the serial number begins with an "A", "B", "C". "D", "E", or "F", then please refer to the old style 421-1102 pump.

421-1112 Pump Specifications

Air Flow: 8.5 CFM

Minimum Speed: 500 RPM

Maximum Speed: 1100 RPM

Bore Size: 2 ¹/₂ in.

Stroke Size: 2 in.

Flywheel Size: 10 ³/₈ in.

A Section Belt Grove: ¹/₂ in. NPT Ex. Port

Unloader Port: ¹/₈ NPT

Dimensions of the 421-1112 Pump:

Pump Height: 13 ³/₄ in.

Pump Width: 11 ¹/₈ in.

Pump Depth: 10 in.

Weight: ~50 lbs.

Stroke Size: 2 in.

Sheave Size: 6.32 in. @ 1725 RPM

Bore Diameter: 2 in.

Flywheel Diameter: 10 ¹/₈ in.

NPT Outlet Size: ¹/₂ in.