4" plastic plumber's plug for 4" tubing, fits, 304_Stainless Steel tubing, PVC, ABS & other 4" - 4.25" tubing ID. An ideal lid for a cell, it can be adjusted to fit any size of 4" to 4.25" tight or lose, so in case of cell back fire, this lid will blow off. It can be tightened by smashing the large rubber grommet between to round plates by the center bolt. There is room to drill holes for gas output hoses, water filler cap or water fill system, electrode connections and optional air line in, to the bottom of the cell.

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