Replace torn or damaged diaphragms on the Hypro D403 Diaphragm Pump with the parts provided in this Hypro D403 Diaphragm Repair Kit with Sight Glass O-Ring - 9910-KIT2423-O.
This repair kit is basically the same as the popular Hypro 9910-KIT2423 Diaphragm Repair Kit, but it includes a bonus 9910-390180 Sight Glass O-Ring for your Hypro D403 Pump.
Diaphragms most likely need to be replaced if you notice a milky grey color in the oil sight glass. This usually indicates the diaphragms are damaged and need to be replaced as soon as possible. Running your diaphragm pump with torn diaphragms can cause serious damage to your pump, so it is always a good option to have a repair kit nearby just in case you need it.
Hypro 9910-KIT2423-O Diaphragm Repair Kit with Sight Glass O-Ring includes: