Vacuum or collector
Central Machinery 59726 inlet: 4 in, inlet cap and vent pipe
Harbor Freight's 59726 manual lists a 4 in inlet, a multi-opening inlet with a cap for the unused opening, and 4 in vent pipe sold separately.
Also listed as 59726, Harbor Freight 2 HP dust collector
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Short answer
Harbor Freight's manual lists a 4 in inlet for the Central Machinery 59726 and shows a multi-opening inlet with a supplied cap for the unused opening. For a new system it says to connect 4 in vent pipe, not included, with tool hoses running to adapters into that pipe. The catch: the manual gives no size for each opening and names no pipe standard. See dust-collector inlet sizes.
Key facts
- Machine type
- 2 HP dust collector (Harbor Freight manual)[1]Reference machine only, not a recommendation.
- Inlet size (maker's label)
- 4 in inlet (manual specifications)[1]Nominal value only.
- Inlet configuration
- Multi-opening inlet; the manual does not state each opening's size[1]
- Inlet parts supplied
- Inlet and inlet cap; Harbor Freight says to cap the unused inlet when only one is in use[1]
- Hoses and connectors the maker names
- 4 in vent pipe, not included, to the 4 in inlet side; tool hoses to appropriately sized adapters into the pipe, all sold separately[1]The manual does not name a pipe standard.
- Tools the maker says connect directly
- Not confirmed
- How to identify your unit
- Harbor Freight: give UPC 193175575661 when ordering parts; some parts are not sold individually[1]
- Source date
- Manual marked Copyright 2025[1]
- Not confirmed
- Not confirmed
Watch out for
- Harbor Freight's '4-inch vent pipe' names no standard. S&D PVC, Schedule 40 PVC and metal duct are different parts.
- The inlet has more than one opening, but the manual does not state each opening's size. Only the 4 in inlet figure and the cap are confirmed.
- Order parts by the UPC Harbor Freight gives; it says some parts are not available individually.
What fits
Product details below are the seller's own description unless a source is shown. Pick the variant named for each item.
4 in hose
POWERTEC 70111 4 in x 10 ft clear flexible PVC dust collection hose, left-hand spiralChoose the 4 in x 10 ft hose.
POWERTEC sells it for 4 in dust collection systems. Harbor Freight states the inlet only as 4 in, so compare the inlet with the hose before you clamp it.
4 in hose clamps
POWERTEC 70260 4 in keyed bridge hose clamp, 10‑packChoose the 10-pack of 4 in key clamps.
POWERTEC lists a 3-1/2 to 4-3/8 in clamping range.
Questions
What size is the 59726 inlet?
Harbor Freight's manual lists a 4 in inlet. It shows a multi-opening inlet but does not state each opening's size.[1]
What do I do with the unused inlet?
Harbor Freight says to cap it with the supplied inlet cap when only one inlet is in use.[1]
Which pipe does the 59726 manual mean?
It says '4-inch vent pipe', not included, and names no standard. The fitting standards guide explains why the standard matters.[1]