We drilled it with 9/16 diameter hole. Works great and easy to install.
Dig Drip Irrigation 1/2" Compression Tee, 700 OD
DIG Drip Line 100', 9" Spacing, 1/4" Dripline, 52 GPH
Fastcap JIG-A-DECK
Nuk3y Thor Leverset
FastCap Knuckle Bender 3 in 1 simple door adjuster