Specialty parts counter
The petroleum tank parts
other shops can't find.
We carry a deep inventory of specialty petroleum tank trailer parts on the shelf in Knoxville. Hardware, fittings, gaskets, valves, R-Stamp consumables. The stuff that's a special order at most truck shops — ours when you need it.
Categories
What's on the shelf.
Stocked deep for the tanks we work on every week — DOT 406, 407, 412, propane, LPG. If it's a service item on a petroleum tank trailer, we likely have it. If not, one phone call usually sources it inside 24–48 hours from our distributor relationships.
Tank hardware
- Manhole assemblies and gaskets
- Vapor recovery components
- Bottom valves and adapters
- Sump and discharge hardware
- Vent and pressure relief assemblies
Fittings & valves
- API couplers and adapters
- Dry-disconnect fittings
- Ball valves (cargo + product)
- Check valves and shutoffs
- Cam-and-groove fittings
Gaskets & seals
- Viton, Buna, EPDM, PTFE
- Manway gaskets (full ring + segmented)
- Flange and fitting gaskets
- O-rings (kit and bulk)
- Custom-cut sheet stock
Ladders & walkways
- Spring-loaded ladder hardware
- Walkway grating and brackets
- Handrail components
- Tie-down rings and D-rings
- OSHA-compliant fall-protection points
R-Stamp consumables
- P-No. matched filler wire and rod
- Backing strips and purge fittings
- NDT consumables (PT, MT)
- Heat-treat thermocouples and pads
- Documentation tags and stamps
Electrical & lighting
- Hazmat-rated wiring
- Sealed marker and tail lights
- 7-way and 4-way connectors
- Junction boxes (sealed)
- DOT placards and holders
Beyond our shelf
Need a non-petroleum part? Same network.
Post Onsite is petroleum-tank specialty. For general trailer parts (brakes, lights, suspension, reefer) or truck mechanical parts, we have two sister locations under the same family with the same fleet-account billing. One call to us routes the order to the right shelf.
Knoxville — trailer parts
Knox Trailers
A deep inventory of trailer parts on the shelf. Brake chambers, slack adjusters, reefer parts, lights, air components. Haldex, Bendix, Meritor, Carrier, Thermo King.
Knox Trailers parts →Crossville — truck + trailer parts
KP Crossville
A full aftermarket truck and trailer parts inventory on the I-40 corridor, 45 minutes west of Knoxville. Engine, drivetrain, brakes, electrical, DOT compliance.
KP Crossville parts →Deep combined inventory across three locations. Fleet customers running both Knoxville and Crossville-area routes can use one account across all three.
How to use the counter
Two ways in.
Call ahead
Call with the tank type and the part you need. We'll confirm what's on the shelf, pull it, and have it ready when you get here. Saves your mechanic 30 minutes per stop.
Fleet account billing
Fleet customers run on net-30 with PO-friendly invoicing. One account works across Knox Trailers, Post Onsite, and KP Crossville. Set up a fleet account by calling.
Walk-in
2600 Middlebrook Pike, Knoxville, TN 37921. Counter open Mon–Fri 7am–5pm. Cash, card, or account billing.
Need a petroleum tank part today?
Counter is open Mon–Fri 7am–5pm. Call ahead and we'll have it pulled.