This is the genuine Bosta wide fastening flange (part No. 40) designed for the STP series counter-current system. It serves as a key wall-mounting component that secures the STP jetstream housing firmly to the pool wall during installation, ensuring a stable and water-tight fit. The wider flange profile provides an extended clamping surface, making it especially suited to pools with liner or foil finishes where a larger bearing surface is required.<\/p>\n
This flange is an original spare part for the Bosta STP and STP-SS counter-current system series. It is referenced as item No. 40 in the official STP installation diagram and works in conjunction with the mounting screws (No. 38) and the jetstream housing (No. 41). Always verify your STP model and part diagram before ordering to confirm fitment.<\/p>\n
Using an authentic Bosta replacement flange guarantees precise dimensional tolerances and material quality matched to the original assembly. Off-brand alternatives risk poor sealing, accelerated wear, and may void any existing warranty on your counter-current system. A correctly fitted flange prevents water ingress behind the pool wall and keeps the STP unit securely in position under continuous pump load.<\/p>\n
The wide fastening flange is fitted from inside the pool wall opening, with the pool liner or foil clamped between the flange and the jetstream housing. Once positioned, the mounting screws are tightened to compress the seal, and excess liner material is trimmed from the inner face of the flange. Professional installation by a qualified pool technician is strongly recommended to ensure a water-tight and structurally sound result.<\/p>","protected":false},"excerpt":{"rendered":"