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![](https://static.wixstatic.com/media/a71c09_634535407a98478aadb40a68566941eb~mv2.png/v1/fill/w_315,h_312,al_c,lg_1,q_85,enc_avif,quality_auto/a71c09_634535407a98478aadb40a68566941eb~mv2.png)
8 in. Cistern or Knockout Block
8" x 8" x 16"
![](https://static.wixstatic.com/media/a71c09_8093f11629fb443a8d18047e2df9d325~mv2.png/v1/fill/w_980,h_484,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/a71c09_8093f11629fb443a8d18047e2df9d325~mv2.png)
![](https://static.wixstatic.com/media/a71c09_872357ba9a8e4d7c87aae97d43bcae85~mv2.jpg/v1/fill/w_970,h_802,al_c,q_85,enc_avif,quality_auto/a71c09_872357ba9a8e4d7c87aae97d43bcae85~mv2.jpg)
![](https://static.wixstatic.com/media/a71c09_ff4147084c5f4ae7b70ca9b1e4890a5b~mv2.jpg/v1/fill/w_706,h_683,al_c,q_85,enc_avif,quality_auto/a71c09_ff4147084c5f4ae7b70ca9b1e4890a5b~mv2.jpg)
![](https://static.wixstatic.com/media/a71c09_8093f11629fb443a8d18047e2df9d325~mv2.png/v1/fill/w_980,h_484,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/a71c09_8093f11629fb443a8d18047e2df9d325~mv2.png)
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Used for cistern walls and retaining walls, providing horizontal strength
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Strengthens with age
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Durable; Protects against fire, wind, and rain.
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Made with high quality
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