These push up door traps are easy to use and have a trip wire and a trigger mechanism to set them off. The door falls when the initial hog hits the trip wire in the back of the trap. HogMaster traps can catch just one or multiple hogs even after the door has fallen. The other hogs on the outside of the trap just root the door up and enter the trap with the hogs that are already captured. The design of the door and bracing around it do not allow the captured hogs to open the door from the inside.
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When I sell a trap to some one that has never used one of these style trap doors there
are a few KEY instructions that I give them.

** Set the trap in an area that you have active hog sign in and that you know hogs are visiting.

**  Try and place the trap where it might have some natural shade from trees or cover

    in the area your wanting to trap in.

** If your trap does not have a bottom be sure to use at least 4 "T" posts to stake it down

   (one in each corner) I would suggest 6 posts, one on each corner and one in the middle of the

   sides of the trap.

**  If your trap has a bottom I would still suggest to put at least ONE "T" post at each end so when

    they charge the end and ram the trap it will not be 100 yards from where you set it or even

    worse in the creek or pond near where you set the trap.
** When you set the trap for the first time make sure the door is tied or wired OPEN.

**  In the first picture posted below you can see a black feed / water bucket in the area next

    to the door(THESE DO NOT COME WITH THE TRAP). This 2' space is a great spot for a

    water source for the hogs especially in the heat during the summer months.This will allow you to             check your trap every 2 days instead of every day if you didn't have water for the hogs.Be sure

    to tie the bucket to the panel in at LEAST 2 points or the hogs will knock it over. You can

    also put a piece of tubing or rebar over the bucket and tie that off to the trap somewhere. What

    ever method you find that works use it.
** Bait the trap with what ever you plan on using. I would suggest just plain corn or Horse Sweet     

    feed works well. Some folks use SOURED CORN but that seems to attract the varmints like     coons,possums and skunks.(JUST MY OPINION) Use about 25 to 50 pounds of corn and pour it            all over in  the trap from the back corner where the trip wire runs across the trap about 12" off of the        ground and leave a trail coming out of the trap as many feet as possible away from the trap. If there       is  a well used trail near the trap than make a trail of bait to the trail so they can find it easier.

* Front view of baited trap. Notice how the corn goes in

and follows the outside edge of the trap until it stops where

the trip wire runs across the corner in the back. This is where

you pile a little extra corn so when the hogs are rooting around

they will hit the trip wire and close the door.( SEE PIC BELOW )

* Rear view of baited trap.You can see that the corn stops

where the trip wire runs across the corner in the bottom

right of the picture.

** Leave the trap baited and the door tied OPEN for a few days or until you have POSITIVE sign of hogs     going in the trap (ie, corn is completely devoured and there is rooting every where) Patience is               very important. It might take a couple of weeks .

    After you have good sign and feel that the hogs are going inside the trap every night than it's

    time to set the door with the trigger mechanism mounted on the top of the trap.
** Once this is done all you have to do is check the trap the next morning. I would strongly suggest         checking your trap the day after you set it.Hogs will not do very well in direct sun and without water
    for very long. They will die from stress and dehydration and you don't want that. Not to mention

    the longer they stay in the trap the other hogs that may visit them from the outside will

    figure out real fast that your trap is a bad place to be and will become trap smart

    and the odds of catching them in the future are slim.
** Once you have the hogs in the trap you can load them into a trailer and haul them off alive.
    This is so you can take them to the market to sell them or back to your holding pen to butcher
    at a later date. The other options are to shoot them , jump in with them and tie their legs together

    or to just let them free.Shooting them is ok if thats your only option. Many times after I had shot

    hogs in a trap the other hogs in the area would not go into that trap for a good  while . As well

    I have had them go into the trap with fresh blood on the ground the very next night. This

    happened on ranches that were very over run with hogs and they were really fighting for food.

   Setting them free will only help educate the entire herd of hogs and make any trapping

   in the future a much greater task than you want to deal with.

Video Clip Showing How To Bait And How The Trip Wire Works

[Right click on the text above and "Save Target As..." This file is 7 + MB and could take

   15 + minutes to upload with a "Dial-Up Connection"] Sorry....

I hope this information was of some help to you and if you have any further questions than just shoot me an e-mail..Thanks