The Berkey Light Blocking Plug is a rubber plug for blocking unused filter holes in the upper chamber of the Berkey Light systems.
All Berkey Light systems come standard with the proper amount and size of blocking plugs; in case of loss or damage, replacement plugs may be purchased individually.
The large blocking plugs may also be used with the Berkey stainless steel systems.
Please identify the manufacturing date on the Berkey Light system to determine which size blocking plug is required. The manufacturing date may be found on the embossing on the bottom of the upper chamber. If the two-digit number in the circle is 13 or lower, the XRP-SM plug is needed. If the two-digit number in the circle is 14 or larger, the XRP-LG plug is needed