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Graco 104991 Sight Glass Kit

Replace the FRL bowl window with the OEM Graco 104991 Sight Glass Kit—made for the 3/8 in filter unit 106148. Verify your filter model/port size before ordering.

  • Part #: 104991 (Sight Glass Kit)
  • Fits: Graco air filter 106148 (3/8 in)
  • Use: Restores clear viewing window/seal
  • Note: Not a pump/fluid-path sprayer part (FRL filter only)
  • Related sizes: 1/2 in 104992, 3/4 in 104993

$64.53
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Overview & Key Details

The Graco 104991 Sight Glass Kit is a factory replacement sight-window kit for select Graco air filter units. It restores a clear viewing window on the filter bowl so you can visually monitor bowl condition and maintenance needs.

Compatible Machines / Units

This kit is for the air filter (FRL) assembly—compatibility depends on the filter unit installed with your machine. Confirm the filter model on your equipment before ordering.

  • Graco Air Filter Kit 106148 (3/8 in) — uses 104991 Sight Glass Kit.

Why choose the 104991 Sight Glass Kit?

  • OEM fit & function for Graco FRL filter bowl sight-window replacement.
  • Quick visual checks of bowl condition without removing components.
  • Minimizes downtime—simple service item when the original window is hazed, cracked, or leaking.

Specifications

Attribute Detail
Part Number 104991
Description Sight Glass Kit for Graco FRL air filter bowl
Intended Filter Unit Kit 106148 (3/8 in)
Application Restores clear viewing window for bowl inspection/maintenance
Category Air Preparation / FRL Accessories

Frequently Asked Questions

It replaces the clear sight-window assembly on the FRL filter bowl, restoring visibility and sealing. Contents are as supplied by Graco for the specified unit; always verify with your manual or parts list.

It fits machines only if they use the matching FRL filter unit 106148 (3/8 in). Many sprayers do not use this filter; confirm your air filter model/size before ordering.

For similar FRL filters, the common sight-glass kits are typically:
  • 104992 — for 1/2 in filter unit (e.g., kit 106149)
  • 104993 — for 3/4 in filter unit (e.g., kit 106150)
Always match by your filter unit model and port size.

Depressurize the air line and follow the equipment manual. Inspect and clean the sealing surfaces, install the new sight window and seals as directed, and verify there are no leaks before returning to service.

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