Sewer-and-drain vs Schedule 40 PVC for dust collection

Short answer

Both are sold as "4-inch" PVC, but sewer-and-drain (S&D) and Schedule 40 are made to different standards with different dimensions, and each needs its own adapter to meet dust-collection hose or fittings. Read the standard printed on the pipe, ASTM D2729 or ASTM D1785, before you buy adapters. No source we found compares the two for dust collection.

Picks that fitAll picks and how to choose

Rockler Dust Right 4 in fitting for PVC sewer pipeCheck price on Amazon

Two standards, not two grades

Sewer-and-drain PVC and Schedule 40 PVC are not a thin and a thick version of one pipe. They come from different specifications:

ASTM D2729 is the standard specification for PVC sewer pipe and fittings; ASTM lists D2729-21 as active.^[1]
ASTM D1785 covers PVC pipe in Schedule 40, 80 and 120 sizes; ASTM lists D1785-26 as active.^[2]

Neither standard addresses dust collection. They describe the pipe; they do not approve it for a dust system.

How to tell which pipe you have

Read the print along the pipe. It names the standard (D2729 or D1785) and usually the schedule or type. If there is no print, ask the seller or the pipe maker before buying adapters; the two families are not interchangeable.

What we can publish for Schedule 40

Charlotte Pipe's Schedule 40 submittal says its pipe is Iron Pipe Size conforming to ASTM D 1785 and is meant for pressure uses up to 140°F.^[3] For 4-inch belled-end Schedule 40 pipe, it lists a socket entrance ID of 4.509 to 4.527 inches.^[3]

The submittal gives no pipe outside diameter or wall figures, so we do not publish any.

What we can publish for S&D

We could not verify an outside diameter or wall figure for S&D pipe, so we publish none. What we can give is an adapter maker's statement: Woodcraft says its WoodRiver 4-inch S&D adapter fits inside 4-inch S&D pipe with a 4.065-inch ID and suits pipe marked ASTM D2729.^[4]

Adapters for each

Pipe	Adapter	What the maker says	Source
Schedule 40	Rockler 52680	4.5-inch ID rubber end, 3.99-inch OD plastic end; joins a 4-inch dust fitting to Schedule 40 pipe	Rockler
S&D	WoodRiver 4-inch S&D adapter	Fits inside 4-inch S&D with a 4.065-inch ID; left-hand threaded hose only	Woodcraft
S&D	Any	Rockler: S&D does not connect directly to most dust fittings without an adapter	Rockler

Sources: Rockler's 52680 page,^[5] Woodcraft's WoodRiver page^[4] and Rockler's system guide.^[6]

Picks that fit1 product

Choose this Rockler fitting only for sewer-and-drain pipe, not Schedule 40; read the standard printed on your pipe first.

Which is better for dust collection?

We cannot say. No source in our register compares S&D and Schedule 40 for dust use, so the choice here is about fit: pick one, buy the adapters made for it, and do not mix them without a transition.

The pipe maker's warning

Charlotte Pipe warns never to test with, transport or store compressed air or gas in PVC pipe or fittings.^[3] That is the pipe maker's own warning, quoted as written. It is not a statement about dust collection either way.

We give no glue, cement or solvent advice, and no static or fire claims about PVC. For those questions, the wood dust, fire and static guide points to OSHA and NFPA.

Questions

Is S&D pipe the same as Schedule 40?

No. S&D is made to ASTM D2729 for sewer pipe and fittings; Schedule 40 is made to ASTM D1785. They need different adapters.^[1]^[2]

Which is better for dust collection, S&D or Schedule 40?

No source in our register compares them for dust use, so we compare fit only. Pick one and buy adapters made for it.

How do I tell which PVC I have?

Read the standard printed along the pipe: D2729 for sewer-and-drain, D1785 for Schedule 40. If there is no print, ask the seller or pipe maker.

Do I need a special adapter for S&D pipe?

Yes. Rockler says S&D does not connect directly to most dust fittings without an adapter, and Woodcraft's WoodRiver S&D adapter fits inside 4-inch S&D with a 4.065-inch ID.^[6]^[4]