Racing rad cap 21-25psi.& nbsp;<div>These caps fit standard SAE “A” size (2 1/8″ OD 3/4″ deep) filler necks.& nbsp;</div><div><span id=”sceditor-end-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span><span id=”sceditor-start-marker” class=”sceditor-selection sceditor-ignore” style=”line-height: 0; display: none;”> </span>These do not include an upper gasket so they are for use on open cooling systems only.<p style=”” class=””><br> </div>