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The toilets trap way is designed to accomidate waste and water at a given speed, if your old tank for instance has a flush rate of say 3.6 to 4.0 GPF this tank will not work. The connection to the old toilet might not match up also. You would be better off to replace the Toilet Bowl at the same time, most toiiets by law now are required to be efficent so finding an older style tanks that flushes that amount of water will be difficult. But you can take a small bucket of water 1.6 gallons, pour it quickly down the toilet with some Toilet Papaer in and see if it flushes it completely. If it does then this tank will work. I hope this answers your question. Thanks for choosing Grainger Ask & Answer!<br /><br />Wadeh</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">9 months ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_Wadeh" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/WadeH/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_dsrmtknv8s6ojmdy6wy80j1uz_ID', 'http://answers.grainger.com/answers/5049-en_us/WadeH/profilesnapshot.djs?format=embeddedhtml', 'ProfileSnapshotFrame' ,500, 500 ) && 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data-bvcsref="http://answers.grainger.com/answers/5049-en_us/product/2EMZ7/subscribeanswers.htm?format=embeddedrpc&contentid=46035&answers=true&user=__USERID__&authsourcetype=__AUTHTYPE__" data-bvtrack="eventTarget:Product,eName:ProductFollow" data-bvcsappcode="qa" name="BV_TrackingTag_Question_Display_SubcribeContent" class="BVDILink BVDI_CSSubmitLink" data-bvcssubjectid="2EMZ7" href="javascript://" data-bvcssubjecttype="product"><span class="BVDILinkSpan">I have this question too</span></a></div></div> <div class="BVQAQuestionAnswerDivider"><h2 class="BVQAQuestionAnswerDividerHeading">Answers </h2></div><div id="BVQAQuestion46035Answers" class="BVQAAnswers"><div id="BVQAAnswer47724" class="BVQAContent BVQAAnswer BVDI_BAContentTechSupport"><div class="BVDI_BA BVDI_BAAnswer"><div class="BVDIInside BVDI_BAInside"><div class="BVDIBody BVDI_BABody"><ul class="BVDI_BAList"><li class="BVDI_BAItem BVDI_BAItemOdd BVDI_BAItemTechSupport"><a onclick="return false;" class="BVDILink BVDILinkDisabled" title="Tech Support" id="BVDI_BABadge_pypjtb37zmbfish9i5k0qfojq_ID"> <span class="BVDILinkSpan">Tech Support</span></a></li></ul></div></div></div><div class="BVQAContentText BVQAAnswerText"><div class="BVQAContentLabel BVQAAnswerLabel">Answer: </div>Hello,<br />Most toilets tanks operate by gravity, flush the handle and a large flapper opens causing the water in the tank to fall thru the trapway of the bowel. This rapid "flush of water causes it to carry the waste and clean water thru the trap and down the toilet, the only time you woulld require a pump would be if you had very low water pressure.<br />I hope this answers your question, thanks for using Grainger Ask & Answer!<br /><br />Wadeh</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">9 months ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_Wadeh" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/WadeH/profile.htm" onmouseover=" 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