Bat houses should be mounted on 2" EMT conduit manufactured by Allied using 2" 2 hole EMT Halex strap. Allied's 2" conduit has a 2.197" diameter according to their web site. The specs on the Halex web site for the diameter of the 2" strap is 2.20". Based on my mock up, at least one washer is needed under each leg of the strap for a proper fit. This photo has one washer under each strap and tightened with a nut driver. As an alternative you could use the HW strap with a 2.30" diameter. You would need at least one washer on the inside of the strap for a firm fit.
Of course, you can use any supplier of conduit, but max diameter should be 2.197"
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