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Technical Data Sheet
26373 REV D PC 53 ✓ Verified by PartsTable
· ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The SEAL,PLAIN is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-304-7766, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
26373 REV D PC 53
NSN: 5330-01-304-7766
FSC: 5330
CAGE: 52249 — MESTEK, INC. DBA AMERICAN WARMING & VENTILATING DIVISION DIV AMERICAN WARMING AND VENTILATING (USA)
SPECIFICATIONS
Part Number26373 REV D PC 53
NSN5330-01-304-7766
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 26373 REV D PC 53 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
741-2Interchangeable
interchangeable cross-reference
interchangeable
GW810BS1Interchangeable
interchangeable cross-reference
interchangeable
177003-71Interchangeable
interchangeable cross-reference
interchangeable
503-S 34Interchangeable
interchangeable cross-reference
interchangeable
12234Interchangeable
interchangeable cross-reference
interchangeable
B94.11MInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 26373 REV D PC 53?
26373 REV D PC 53 is a SEAL,PLAIN.
What parts can replace 26373 REV D PC 53?
There are 23 known substitutes for 26373 REV D PC 53: 741-2, GW810BS1, 177003-71 and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 26373 REV D PC 53?
26373 REV D PC 53 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-01-304-7766. This indicates validated use in U.S. government and defense supply chains.
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