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
40306D
In stock · ships from Knoxville
This is a 4-inch Victaulic grooved nipple, a pipe fitting used to join two sections of piping where one connection is grooved for a Victaulic coupling and the other is male NPT threaded.
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
We don't publish fitment for this part yet. Rather than guess, get it confirmed against your truck in under a minute.
It serves as an adapter between a grooved-end pipe or fitting and a female-threaded component (valve, pump, or another pipe). Typically made from carbon steel per ASTM A-53 with Schedule 40 wall thickness, it is common in fire protection, HVAC, and industrial grooved-piping systems. You would replace it when the grooved surface becomes worn, pitted, or corroded, as a poor groove profile can cause leaks under pressure.
Part Number: 40306D
VICTAULIC NIPPLE 4 M/S
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more