SELKIRK 187706 GAS VENT WALL THIMBLE, TYPE B, 6-IN.

SELKIRK 187706 - GAS VENT WALL THIMBLE, TYPE B, 6-IN. - 6", 6RV-WT, WALL THIMBLE, ADJUSTS 4-1/8" TO 7" TO FIT WALL THICKNESS, ROUND TYPE B GAS VENT. ROUND GAS VENT DOUBLE WALL CONSTRUTION WITH IT'S BUILT-IN AIR SPACE, PROVIDES PERMANENT INSULATION AND KEEPS THE INNER PIPE HOT AND OUTER RELATIVELY COOL ADJUSTS FROM 4-1/8 INCHES TO 7 INCHES TO FIT THICKNESS OF WALL USED TO ENSURE CLEARANCE TO COMBUSTIBLES IS MAINTAINED AND ALSO SERVES AS A FIRESTOP UNDERWRITERS LABOTORIES UL 441 AND NATIONAL FIRE PROTECTION AGENCY NFPA 54 AND NFPA 211 VENTING GAS FIRED APPLIANCES, WATER HEATERS, FURNACES, STOVES, ETC. LOCKTAB-AN ALTERNATIVE METHOD TO SECURE PIPE WHEE - EQUAL TO 790261