Left-hand or right-hand? Ordering a weathertight door correctly
The 10-second test for door handing, plus the four details to put on every door order.

Short answer
Stand outside the compartment with the door swinging toward you. If the hinges are on your right, it is a right-hand door; if they are on your left, it is a left-hand door. Then specify style, clear opening and handing on the order.
The 10-second handing test
Stand on the outside of the compartment with the door swinging toward you. Hinges on the right = right-hand door. Hinges on the left = left-hand door. That is the convention used across Sinooutput's weathertight door range.
Pick the style
- 4-dog (UMC-WTD-4D): ¼" plate, clear openings 26" × 54", 26" × 60", 30" × 60".
- 6-dog (UMC-WTD-6D): built to ABS and Lloyd's specifications, 26" × 60" up to 30" × 72".
- Quick-acting (UMC-WTD-QA): one hand wheel drives all six dogs.
- Lever arm (UMC-WTD-LA): 28" × 72" and 30" × 72".
What to put on the order
- Style and model number
- Clear opening
- Handing (left / right)
- Any certificate you need with the shipment
Replacement dog handles (UMC-WTD-DOG) fit 4-dog and 6-dog doors and are available in both orientations.
Frequently asked questions
How do I tell if a door is left-hand or right-hand?
From outside the compartment, with the door swinging toward you, hinges on the right means right-hand; hinges on the left means left-hand.




