This is for 1 pair, usually you will requie a pair so ensure you choose a quantity of 2 if that is the case.
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
Rubber plug for blocking unused filter holes in the upper chamber of the Berkey Light System
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
XRP-LG may be used with stainless steel Berkey Systems
XRP-LG color may vary