Your cart is empty
Browse our catalog to find the parts you need.
These images are illustrative and may not match the product exactly. Always verify by part number — or confirm instantly with the assistant using a photo or VIN.
Post Onsite · Hardware & Fasteners
121-2
In stock · ships from Knoxville
This is a brass hex‑head pipe plug with 1/8‑inch male NPT threads.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 1 applications
Add your truck to see whether it's one of them
All confirmed applications for this part number.
Other applications
Other applications
This is a generic pipe plug, not specific to a particular truck make or model. It fits any female 1/8" NPT thread common on commercial vehicles and industrial equipment.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 11 of 11.
Different year, make, or config? Get a confirmation against your truck in under a minute.
It seals unused or service ports in low‑ to medium‑pressure fluid and gas lines, including air brake, fuel, oil, water, natural gas, LP‑gas, refrigeration, instrumentation, and hydraulic systems. You typically replace it when a port is leaking, when the plug is corroded or damaged, or when you need to reconfigure a plumbing or air‑line installation. The hollow‑core design saves weight while maintaining a 1200 psi pressure rating.
Part Number: 121-2
1/8 PIPE PLUG 121-2
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
