Drill a 1/4" hole in the top of the chemical tank. Push the 1/4" tubing in the hole in the tank.
Then push on the weighted strainer on the 1/4" tubing.
The inlet is identified by an arrow pointing toward the pump. Be sure the sleeve is installed on the tubing properly. The beveled side of the sleeve should be facing the pump. Tighten the nut hand tight while holding the pump fitting. Do not use tools or damage could occur. Hand tightening will be sufficient.
Tighten it hand tight.