3M Fire Barrier Block B258, Maroon Color, Pre-Formed Foam, Easy Installation, Sound Buffering, 2.36 in x 5.12 in x 8 in magnifying-safety-glasses Top hole: 3-inch opening

Top hole: 3-inch opening

5 lb pH Down: Your spa’s pH needs to be in the range of 7

Also available in Non-Adjustable versions

Fits 3-port Compool

GREAT FOR STOMACH-ACHES: Nobody likes having a stomachache

3M Fire Barrier Block B258, Maroon Color, Pre-Formed Foam, Easy Installation, Sound Buffering, 2.36 in x 5.12 in x 8 in magnifying-safety-glasses Top hole: 3-inch opening3M Fire Barrier Block B258, Maroon Color, Pre Formed Foam, Easy Installation, Sound Buffering, 2. 36 in x 5. 12 in x 8 in TESTED AND LISTED: Up to 2 hours in accordance with ASTM E814 (UL 1479) and CAN ULC S115 TIGHT FIRESTOP SEAL: Pre formed foam block maintains tight firestop seal to prevent fire, smoke and toxic gas transmission SUITABLE FOR MEDIUM TO LARGE APPLICATIONS: Fits medium to large openings in wall and floor through penetrations NO CURE