T-H Marine 12" Screw-In Overflow Drain Tube – 1-1/8" Threaded, Top Screen, Glued

Secure Screw-In Overflow with Built-In Top Screen

The T-H Marine 12" screw-in overflow drain tube offers a more secure, threaded connection compared to push-in style tubes — ideal for livewell and baitwell setups where you want the standpipe to stay firmly in place. It threads directly into a 1-1/8" threaded drain fitting and features a glued top screen to keep debris out of the overflow line.

Draining is simple: unscrew the tube halfway to expose the drain holes and let the livewell empty by gravity — no need to fully remove the tube. Screw it back in to seal and resume normal overflow operation.

Key Features

• Screw-in threaded connection — threads securely into a 1-1/8" threaded drain fitting for a stable, rattle-free fit
• Partial-unscrew drain — unscrew halfway to expose drain holes for gravity draining; no need to fully remove the tube
• Glued top screen — permanently attached screen keeps debris out of the overflow line
• 12" white PVC standpipe — sets overflow height inside the livewell or baitwell
• Threaded seal — positive seal when fully screwed in; no leaks at the connection point
• Fits 1-1/8" threaded drain fittings

Installation Notes

• Requires a 1-1/8" threaded drain fitting — not compatible with push-in style thru-hull fittings
• Thread fully into the drain fitting to seal; unscrew halfway to open drain holes for emptying
• Top screen is glued in place — permanent, no risk of the screen coming loose

Best For

Livewell and baitwell installations where a threaded, stay-in-place standpipe is preferred over a push-in tube — particularly useful in rough water conditions or high-vibration setups where a push-in tube might work loose. The partial-unscrew drain mechanism is convenient for anglers who want to drain without fully removing the standpipe. If your drain fitting uses a push-in style thru-hull instead of a threaded connection, see the T-H Marine 12" Push-In Straight Drain Tube or the T-H Marine 12" Push-In 90° Drain Tube.

Parts Desk Insights

Recommend the screw-in version when a customer specifically has a threaded drain fitting — this is the key compatibility distinction from the push-in family. It’s also the better recommendation for customers who fish in rough conditions or have had push-in tubes work loose. The partial-unscrew drain mechanism is a useful feature to highlight — customers appreciate not having to fully remove the tube to drain. Confirm the customer’s fitting is 1-1/8" threaded before selling. The glued top screen is a plus for customers who have had screen retention issues with other tubes. If the customer needs a longer standpipe, check whether a trimmable push-in tube in the appropriate size would work, or look for a longer screw-in variant.