2.5" Threaded Vacuum Hose Adapters (Straight Slip & Tapered Ports) V2

This is version 2 of a set of robust threaded hose adapters tailored specifically for standard 2.5” flexible dust extraction hoses. The integrated coarse thread screws directly into the inner spiral of the hose for a tight, mechanical lock that won't pull loose under vacuum pressure or shop movement. Now in a two-piece design joined by a central alignment ring built into the ports, allowing you to print the entire assembly flat on the bed with zero supports required. While it offers a tight friction press-fit during assembly, applying some glue between the components is recommended for permanent workshop durability under heavy tension.

Whether you're hooking up a table saw, router table, or shop vac accessory, these adapters eliminate loose fittings and air leaks. Available in both standard slip and smoothly tapered outer profiles to fit various shop tools and accessories.

Specifications & Dimensions

• Threaded Base (Hose Side): 

  • Sized for standard 2.5” flex hose

  • Inner Diameter (ID): 2.25"

  • Height: 1.25”

  • End Cup Diameter: 3”

  • End Cup Depth: 0.38”

• Straight and Tapered Ports:

  • Port Height: 2” (+0.12 inset)

  • Outer Diameter (OD): 2.49"

  • Inner Diameter (ID): 2 .25"

  • Wall Thickness: 0.24”

• Tapered Port: Features a smooth outer taper from 2.49” (0.5" straight) down to 2.295” across the height of the outer port for a wedge friction fit.

• Total height: 3.25”

Upon request, 57mm outer diameter:

• Same as above except for

• OD: 57mm (2.24409")OD

• ID: 50.6476mm (1.994")

Print Settings & Recommendations

Because these are functional workshop fittings subject to vibration, hose strain, and suction, follow these recommendations for long-term durability:

• Orientation:

  • Threaded Base: Print with the flat profile side directly on the build plate.

  • Ports: Print with alignment ring end upon. 

• Material: PETG, ABS, or ASA are strongly recommended for impact resistance, flex tolerance, and temperature stability in hot shop environments. (PLA works fine for light-duty, but may deform under constant spring-tension from flex hoses).

• Walls / Perimeters: 4 or more walls (Tip: Adding extra perimeter walls dramatically increases torsional strength on cylindrical parts far better than high infill alone).

• Infill: 20% or higher (Gyroid or Grid pattern recommended).

• Layer Height: 0.12mm to 0.20mm (lower layer heights help smooth out the thread geometry for easier threading).

• Brim: A brim on the tapered port is recommended with the small amount of bed contact it has.

Custom Sizing Need a different port diameter or specific taper angle for your setup? Drop a comment below with your exact measurements, and I’ll be glad to generate and upload a custom variant!

Looking to do a single print version (support required), look here for the original version: 

Explore More Workshop Upgrades

Browse my full catalog of custom adapters, dust collection fittings, and workshop jigs here:

• Workshop Tools and Jigs:                         https://www.printables.com/@DPs_Designs_4882792/collections/3599922

• Workshop Dust Collection Fittings:  https://www.printables.com/@DPs_Designs_4882792/collections/3599928