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Backflow Sizing Chart

Find the Right StrongBox Enclosure for Your Backflow Assembly

Use our easy to navigate sizing chart to find the StrongBox enclosure that’s right for your backflow prevention device.

  • Browse common backflow assembly configurations and view recommended enclosure models.
  • Apply filters to narrow your options and find the exact enclosure for your application.
  • Use the search bar above the chart to easily find your backflow model or a StrongBox part number.

Found the right fit? Contact our team today and we’ll help you get started with a quote.

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wdt_ID wdt_created_by wdt_created_at wdt_last_edited_by wdt_last_edited_at Brand Model Pipe Size (in) Length (in) Installed height (in) Total Length (in) Aluminum Enclosure Aluminum Enclosure Smooth Touch SS Cage Smooth Touch SS Cage Smooth Touch CR Cage Smooth Touch CR Cage Expanded Cage Expanded Cage Guardian Cage Guardian Cage
997 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 1.50 7.25 22.13 7.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
998 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 1.50 11.75 23.50 11.75 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
999 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 1.50 9.25 21.50 9.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1000 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 1.50 11.25 23.50 11.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1001 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 975XL3N - N-Pattern RP 1.50 14.45 24.20 14.45 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1002 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 825YA / LF825YA 1.50 14.25 24.00 14.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1003 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 1.25 7.00 21.88 7.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1004 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 1.25 9.25 22.00 9.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1005 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 1.25 8.88 21.00 8.88 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1006 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 1.25 10.25 22.75 10.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1007 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 1.00 5.38 20.38 5.38 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1008 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 1.00 8.75 21.00 8.75 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1009 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 1.00 7.50 19.50 7.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1010 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 420XL - PVB 1.00 7.50 20.50 7.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1011 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 1.00 8.50 21.00 8.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1012 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 975XL3N - N-Pattern RP 1.00 10.61 22.85 10.61 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1013 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 0.50 4.50 19.25 4.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1014 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 0.50 6.25 18.75 6.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1015 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 0.50 6.13 18.25 6.13 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1016 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF007 0.50 10.00 16.63 18.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1017 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 420XL - PVB 0.50 6.00 19.00 6.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1018 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 0.50 6.75 19.50 6.75 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1019 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 375XL -RP 0.50 8.88 18.81 16.88 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1020 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 825YA / LF825YA 1.00 10.25 20.50 10.25 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1021 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF-009 / LF-009-FS 1.00 14.50 18.25 19.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1022 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 2.00 8.50 23.50 8.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1023 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 2.00 12.50 24.25 12.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1024 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 2.00 10.63 21.63 10.63 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1025 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 2.00 12.50 24.50 12.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1026 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 825YA / LF825YA 2.00 15.00 24.50 15.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1027 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Apollo PVB4A/PVBLF4A 0.75 4.75 19.63 4.75 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1028 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 765 - PVB 0.75 6.50 19.00 6.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1029 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF800M4-QT-FZ-PVB 0.75 6.50 18.50 6.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1030 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 420XL - PVB 0.75 6.50 19.50 6.50 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1031 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 720A - PVB 0.75 7.00 19.75 7.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1032 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 350XL 0.75 9.00 17.50 18.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1033 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 950XL3 / 950XL3BFSS 0.75 9.47 15.88 18.47 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1034 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 375XL -RP 0.75 8.88 18.81 17.88 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1035 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 975XL3N - N-Pattern RP 0.75 10.29 20.70 10.29 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1036 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 825YA / LF825YA 0.75 10.00 20.25 10.00 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1037 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF-009 / LF-009-FS 0.75 10.75 18.25 15.75 SBBC-22AL SBBC-22AL SBBC-22SS SBBC-22SS SBBC-22CR SBBC-22CR BC-30CR BC-30CR GC-24 GC-24
1038 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 860 / LF860 1.00 12.50 19.50 17.50 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-22CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1039 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 860 / LF860 0.75 10.75 19.00 15.00 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-22CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1040 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 860 / LF860 1.50 16.50 24.00 22.50 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1041 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 860 / LF860 1.25 16.00 24.00 21.50 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1042 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Watts LF007 1.00 13.25 17.13 23.25 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1043 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 350XL 1.00 11.25 18.50 21.25 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1044 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 950XL3 / 950XL3BFSS 1.00 11.75 16.31 21.75 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1045 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM Wilkins 375XL -RP 1.00 11.19 19.44 21.19 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24
1046 [email protected] 08/31/2026 02:14 PM [email protected] 08/31/2026 02:14 PM FEBCO 825Y / LF825Y 1.00 12.75 18.50 23.00 SBBC-30AL SBBC-30AL SBBC-30SS SBBC-30SS SBBC-30CR SBBC-30CR BC-30CR BC-30CR GC-24 GC-24