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Questions and Answers for Oatey Gripper 4 in. Plastic Mechanical Test Plug

Internet #100204964

Model #33403D

Store SKU #238710

  • Seals or holds pressure while testing a piping system
  • Plastic body protects against rusting and corroding
  • Wing nut makes tightening and removing easy

Questions & Answers

21Questions
caret
Q:How much pressure can this plug hold?
by|Dec 7, 2018
4 Answers
Answer This Question

A:  It is tested to 17 P.S.I.

by|Dec 7, 2018

    A:  very low and depends on the psi and very careful 2 to 3 psi with sand bags to block the plug if blows out

    by|Nov 27, 2023
      1 found this answer helpful

      A:  Normal stack pipe pressure.

      by|Oct 8, 2019

        A:  5 PSIG = 5 PSI The above form works if you are measuring differential pressure, such as the difference in psi between two points. For atmospheric pressure 5 PSIG = 19.7 PSI. For water ft. head it is 40 PSI.

        by|Sep 20, 2023
          caret
          Q:Can this be used to seal a sewer drain pipe? I continue to have problems in my home with backflow during rain storms from a basement sewer drain in the floor.
          by|Feb 21, 2018
          6 Answers
          Answer This Question

          A:  Maybe. They can only take a little pressure.

          by|May 5, 2023

            A:  This is serious plumbing issue, have a professional plumber correct the problem. Mike

            by|Aug 19, 2020

            A:  I used one for capping a cleanout, which previously had a screw cap adapter on 4" ABS pipe, but was broken by excavation. After cutting off the broken adapter and pipe, it worked like a charm. Since I haven't used it long, I can't vouch for longevity of the seal -- I plan to check it every 6 months or so to make sure it's not hardening or becoming stuck. It is, per the name, designed for short-term testing, not permanent use.

            by|Mar 26, 2020
              1 found this answer helpful

              A:  I have this same issue when it rains really hard. Do you use this just when it rains heavy then take it out? Does it work? My ground water drains through this also instead of running a pump, so I only need to plug when it rains heavily.

              by|May 6, 2023

                A:  I have the same problem with periodic backflow from the floor drain in my basement also. Last year I installed a sump pump 3 feet from the floor drain and channeled a 1-1/2" pipe from it to the sump. this unfortunately did not keep-up with the backflow. Since I modified the floor drain pipe, I can no longer attempt to try the mechanical test plug. If you can get it to fit snug and tighten it up good, it just might work for you. There are a lot of variables at play here, so bear in mind to look at this, as an experiment. This coming spring, I am going to try the inflatable test-ball plug. I can install this down into the floor drain, past where the 1-1/2" sump pipe is. I bought it thru Home Depot. It is the Cherne Test Ball Plug - Part No.270-040. This is an experiment also. Keep in mind that water takes the path of least resistance. Once you plug the floor drain, it could start leaking from other places like a nearby toilet, depending on how well it is sealed and or how deep your typical backflow event is, it could come over the top of the toilet bowl itself. These options are just bandaids. Although a handful of parts for less than $50.00 might be worth the trial before spending thousands on Overhead plumbing ,or a backflow preventer valve. Good Luck !!!

                by|May 5, 2023

                  A:  It should work; however, while it will hold some pressure, I'm not sure how much or for how long.

                  by|Apr 10, 2019
                    1 found this answer helpful
                    caret
                    Q:can this be used on cast iron?
                    by|Feb 20, 2018
                    5 Answers
                    Answer This Question

                    A:  Yes.

                    by|May 5, 2023

                      A:  Yes they should fit your cast iron

                      by|May 5, 2023

                        A:  Yes. Just yes.

                        by|May 5, 2023

                        A:  Yes, I've done it several times.

                        by|May 5, 2023

                          A:  It will work on metal or P.V.C.

                          by|Dec 7, 2018
                            caret
                            Q:Could the plug be used on a 2inch hole on a 300 gallon fish tank?
                            by|Feb 24, 2016
                            3 Answers
                            Answer This Question

                            A:  It is for a 4- inch pipe. It is wider on top so sits like a cap. Not sure if other sizes are available.

                            by|May 5, 2023

                            A:  No. You need the 2" for a 2" hole. This is for a 4" hole.

                            by|May 5, 2023

                              A:  No, this model is 4''.

                              by|May 3, 2023
                                1 found this answer helpful
                                caret
                                Q:I have to plug a 4 inch water line that will have a constant 30lbs of pressure in it. Will this blow out at 30lbs?
                                by|Nov 13, 2015
                                3 Answers
                                Answer This Question

                                A:  Mark, i'm sorry but this plug would not be recommended for that application.

                                by|May 4, 2023
                                  1 found this answer helpful

                                  A:  It might. I wouldn't trust it.

                                  by|May 5, 2023

                                    A:  It probably will. The maximum is around 40 psi.

                                    by|Sep 20, 2023
                                      caret
                                      Q:Is the plug 4inches firm? Or is it smaller than 4 inches and expands to fit 4 inches? I need a plug that will fit into a 3.85" hole.
                                      by|Oct 31, 2015
                                      3 Answers
                                      Answer This Question

                                      A:  The range of use for this plug is 3.8" - 4.06".

                                      by|May 4, 2023
                                        4 found this answer helpful

                                        A:  It is for a 4- inch pipe. It is wider on top so sits like a cap. It is slightly smaller at bottom and then expands to block pipe. For the price it's worth trying. Not sure if other sizes are available.

                                        by|May 5, 2023
                                        1 found this answer helpful

                                        A:  As per Oatey: The range of use for this plug is 3.8" - 4.06".

                                        by|May 5, 2023
                                        1 found this answer helpful
                                        caret
                                        Q:Our septic tank riser is a concrete tube. The now open hole is 4 inches in diameter. Thank you.
                                        by|Sep 19, 2015
                                        2 Answers
                                        Answer This Question

                                        A:  Yes. I would trust it there. Ive used them to block iron septic risers several times.

                                        by|May 5, 2023

                                          A:  Yes, i used it to cover a clean out opening in my sanitary sewer line. The plug fit easily into the raised opening, and the wing nut was easy to turn by hand. The plug made a perfect seal and allowed me to easily remove it when necessary. Removing the plug was just as simple.

                                          by|May 3, 2023
                                          6 found this answer helpful

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