VACUUM RELIEF VALVES AND WATER HEATER CONNECTORS Watts Vacuum Relief Valve Watts vacuum relief valve prevents vacuum conditions which could siphon the water from the system and in turn burn out a heater or even collapse a tank. A relief valve automatically vents a closed system to atmosphere levels, and thereby permitting air to enter the pipe. Cat. # Model # 13757 N36 Description 3/4 " MIP vacuum relief valve SharkBite Flexible Water Heater Connectors 3/4 " SB x 3/4 " FIP Cat. # Description 31754 15 " SharkBite Flexible Water Heater Connector 31753 12 " SharkBite Flexible Water Heater Connector 31755 18 " SharkBite Flexible Water Heater Connector 31756 31757 31757 24 " SharkBite Flexible Water Heater Connector 18 " SharkBite Flexible Water Heater Connector with Ball Valve * Mark's Braided Stainless Steel Flexible Water Heater Connectors Cat. # Connection 27752 3/4 " Length 27753 3/4 " FIP x FIP 24 " 27756 3/4 " MIP x 3/4 " FIP 18 " 27757 3/4 " MIP x 3/4 " FIP 24 " FIP x 3/4 " FIP 3/4 " 18 " Mark's Copper " Flex " Water Heater Connectors Packaged 25 per case Cat. # 13412 09876 09877 09878 Cat. # 13413 09895 09896 09897 Connection FIP x 3/4 " FIP 3/4 " FIP x 3/4 " FIP 3/4 " FIP x 3/4 " FIP 3/4 " FIP x 3/4 " FIP Length 12 " 15 " 18 " 24 " Connection FIP x 3/4 " SWT 3/4 " FIP x 3/4 " SWT 3/4 " FIP x 3/4 " SWT 3/4 " FIP x 3/4 " SWT Length 12 " 15 " 18 " 24 " 3/4 " 3/4 " Mark's " Flex " Water Heater Connector Gasket Cat. # Description Packaged 09875 Water heater connector gasket 10 per bag 5-24 PHONE 1-800-772-2347 FAX 1-800-991-6275 31753https://www.markspp.com/Catalog/Detail/12692 https://www.markspp.com/Catalog/Detail/29701 https://www.markspp.com/Catalog/Detail/29702 https://www.markspp.com/Catalog/Detail/29705 https://www.markspp.com/Catalog/Detail/29701 https://www.markspp.com/Catalog/Detail/29703 https://www.markspp.com/Catalog/Detail/29704 https://www.markspp.com/Catalog/Detail/29705 https://www.markspp.com/Catalog/Detail/25816 https://www.markspp.com/Catalog/Detail/25817 https://www.markspp.com/Catalog/Detail/25820 https://www.markspp.com/Catalog/Detail/25821 https://www.markspp.com/Catalog/Detail/12401 https://www.markspp.com/Catalog/Detail/9363 https://www.markspp.com/Catalog/Detail/9364 https://www.markspp.com/Catalog/Detail/9365 https://www.markspp.com/Catalog/Detail/12402 https://www.markspp.com/Catalog/Detail/9382 https://www.markspp.com/Catalog/Detail/9383 https://www.markspp.com/Catalog/Detail/9384 https://www.markspp.com/Catalog/Detail/9362