2" PVC conduit to a NEMA 4 box

For 2" PVC into a NEMA 4 / 4X enclosure: thread a Carlon E943J male terminal adapter into a Myers ST6 watertight hub. Punch the hole with a 2" conduit-size knockout punch, which cuts a 2.42 in (61.5 mm) hole.

Adapter · 2"E943JCarlon male terminal adapter

Hub · 2"ST6Myers zinc, NEMA 4/4X

Hole · 2"2.42 in61.5 mm · Greenlee K3P-2

Support · 2"5 ftmax spacing, NEC 352.30

This page is 2" only. Every part below is the 2" size. For a different conduit size, pick it in the size bar at the top. Don't mix sizes: an adapter only threads into the hub of the same size.

Option A for 2": watertight hub (keeps the NEMA 4 rating)

The hub mounts through the box wall with a captive O-ring on the outside face and its own locknut inside. The 2" male adapter threads into the hub, and the conduit is glued into the adapter. The O-ring is what keeps the NEMA 4 / 4X rating.

Section through a bottom entry. Not to scale.

Order list: 2", Option A

Size	Qty	Part	Mfr #	Notes
2"	1	2" PVC male terminal adapter	Carlon E943J	Glue the conduit into it. Male thread goes into the hub.
2"	1	2" watertight hub, zinc	Myers ST6	Crouse-Hinds (Eaton) Scru-Tite. Captive O-ring, insulated throat.
or, instead of the ST6:
2"	1	2" watertight hub, aluminum	Myers STA6	Aluminum version of the ST6.
2"	1	2" watertight hub	Appleton HUB200A	Die-cast aluminum, integral O-ring, insulated throat.
2"	—	PVC primer + solvent cement	any listed	Rated for 2" conduit.

Option B for 2": sealing locknut (raintight only)

The adapter goes through the hole from outside. The sealing locknut goes on the outside face and a standard 2" locknut on the inside. Bridgeport lists these as raintight, with no watertight or NEMA 4 claim. If the box has to stay NEMA 4, use Option A.

Size	Qty	Part	Mfr #	Notes
2"	1	2" PVC male terminal adapter	Carlon E943J	Same adapter as Option A.
2"	1	2" sealing locknut	Bridgeport 146	Steel with a PVC seal. "Provides raintight seal."
2"	1	2" standard locknut (inside)	any listed	Plain, not sealing.

Hole size for 2"

Use the 2" conduit-size knockout punch (Greenlee K3P-2). It cuts a 2.42 in / 61.5 mm hole.

Knockout punches are labeled by the conduit size they're for, not by the hole they cut. A punch labeled with the hole diameter is a different tool.

Install steps for 2"

Pick the entry. Use the bottom or a side. A top entry collects water against the seal.
Punch the hole with the 2" conduit-size punch (2.42 in). Deburr both faces so the O-ring sits flat.
Mount the Myers ST6 from outside with the O-ring against the outside face. Tighten the hub locknut from inside until the O-ring is evenly compressed. On fiberglass or polycarbonate boxes, stop at firm.
Thread the Carlon E943J into the hub until it's snug. Don't crank on PVC threads. If you use thread sealant, pick one that's rated safe for PVC.
Glue the 2" conduit into the adapter socket. Cut square, deburr, then prime and cement both surfaces. Push it fully home with a quarter turn and hold it for the cement's set time.
Support it within 3 ft of the box and at no more than 5 ft spacing (NEC Table 352.30 for 2"; check your code edition).
Check that the O-ring is evenly squeezed all the way around. If your equipment ground lands in this box, bond the hub's grounding screw.

Don't grab the neighboring size

The next size up and down use part numbers one step away. These are not for 2" conduit:

Size		Adapter	Myers hub	Sealing locknut
1-1/2"	One size smaller	E943H	ST5	145
2-1/2"	One size larger	E943K	ST7	147

Also don't confuse Carlon E943 (male terminal adapter) with E942 (female adapter). At 2", for example, E942J is the female adapter.