We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Ingersoll Rand MC121-3 replacement seat for compatible models

Ingersoll/Rand

Ingersoll/Rand MC121-3 Seat

SKU CH-Q42B-VMR96

Replacement seat compatible with Ingersoll Rand models 121-K6, 121/Q and 772

  • Designed for Ingersoll Rand 121-K6, 121/Q, 772 models
  • Compatible with Grainger items 3Y517, 2Z750, 3JD19
  • Genuine Ingersoll Rand replacement seat
  • New condition, ready for installation
  • Proposition 65 warning: contains listed chemicals

Ingersoll/Rand Seat MC121-3

This Ingersoll/Rand seat is a new replacement component designed for specific air-compressor models. It fits units identified by Grainger item numbers 3Y517, 2Z750 and 3JD19 as well as manufacturer models 121-K6, 121/Q and 772. The part is branded for Ingersoll/Rand equipment.

Installation and system fit

The seat installs directly into compatible compressor valve assemblies, restoring proper sealing without modifications to the surrounding head or cylinder. It replaces a worn original seat and frees the valve plate to operate against a fresh surface, eliminating leakage paths that reduce pressure buildup.

Service capacity and limits

The seat handles the pressure and temperature cycles normal to the listed 121 and 772 series compressors. It is not intended for models outside the specified Grainger and manufacturer numbers, and California Proposition 65 warnings apply regarding chemical content.

Highlights

  • Designed for Ingersoll Rand 121-K6, 121/Q, 772 models
  • Compatible with Grainger items 3Y517, 2Z750, 3JD19
  • Genuine Ingersoll Rand replacement seat
  • New condition, ready for installation
  • Proposition 65 warning: contains listed chemicals

Specifications

BrandIngersoll Rand

Questions about this item

What is the Proposition 65 warning that applies to this Ingersoll Rand MC121-3 seat?

The seat carries a California Proposition 65 warning for a chemical known to cause cancer and another known to cause birth defects or other reproductive harm.

Does the seat generate noise, heat or draw power during all-day use?

The seat has no motor, fan or electrical components, so it produces no noise, no heat and draws no power.

Which Ingersoll Rand models must I already own for this seat to fit?

It fits models 121-K6, 121/Q and 772, and matches Grainger item numbers 3Y517, 2Z750 and 3JD19.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.