Kripsol - Koral KS/KSE casing flange screw (single) - 10300000-21

Kripsol Koral KS/KSE casing flange screw (single)

This is a single OEM screw used to secure the casing flange (plateau d’étanchéité) on the Kripsol Koral KS and KSE pump family, including the Mini Kapri. The casing flange sits at the joint between the pump body and the motor bracket, and these screws are what clamp it into a leak-free assembly under continuous hydraulic pressure.

What this screw does in the Koral

The casing flange screws draw the pump body tight against the motor bracket through the sealing plate, compressing the flange gasket and preventing water from bypassing the impeller chamber. A single damaged, cross-threaded, or corroded screw breaks that clamping force and allows air ingress or water leakage at the split line — a common cause of loss of prime on KS-family pumps.

Which Koral models it fits

This screw is confirmed for the Kripsol Koral KS and KSE pump range, which spans the 33, 50, 75, 100, 150, 200, and 300 models, as well as the Mini Kapri variants that share the same casing flange assembly. Check your existing hardware against this part before ordering if your pump has been previously modified or repaired with non-OEM fasteners.

Signs it needs replacing

Inspect all casing flange screws whenever you strip the pump down for seal or impeller work. Replace immediately if you find any screw with a stripped head, corroded shank, or deformed thread — even one compromised fastener prevents the flange from seating evenly. A pump that repeatedly loses prime despite a new lid gasket and cover seal is often traced back to an insufficiently clamped casing flange caused by a faulty screw.

How to install it

Fit the replacement screw by hand first to confirm thread engagement, then torque evenly in a cross pattern with the other flange screws using the correct screwdriver or socket. Do not overtighten — the thermoplastic pump body is susceptible to boss cracking if fasteners are driven beyond the manufacturer’s specified torque. Reassemble dry, then fill and prime normally before starting the pump.