Description
Conduit and waste pipe are a four-inch problem. Storm drainage, culvert connections, sleeve penetrations through a headwall and vent stacks through a deck are not — they start where the standard barrel range ends, and a bit that is one size too small is a wasted mobilisation rather than a wasted bit.
Order to the sleeve, not the pipe
Four diameters, 16″, 18″, 20″ and 24″. Size to the sleeve you will actually install plus the annulus the detail calls for, not to the outside diameter of the pipe. It is the commonest ordering mistake on large penetrations and the most expensive one to discover on site.
Rig-mounted and wet, without exception
Nothing at this diameter is a handheld proposition. The reaction torque alone makes it a stand job, properly anchored into sound material rather than into a patch, and the stand is also what holds the barrel perpendicular through a long penetration. Wet drilling only — water carries the cuttings up the barrel, cools the crown and stops the tube binding in the hole.
Confirm your motor is rated for the diameter before ordering; an adapter will let you mount a barrel your machine has no business turning. Thread standards are set out in the core bit size and thread guide, and smaller barrels are under wet core bits.
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