Counter Current System, Type Stp exploded view & spare parts

Counter Current System, Type STP — Exploded View & Spare Parts

This page contains the official exploded-view diagram and full bill of materials for the Bosta Counter Current System, Type STP — covering the standard-voltage and stainless-steel variants across the STP-2200, STP-2200SS, STP-3000, STP-3000T, STP-3000SS-T, STP-4000-T, and STP-4000SS-T models. The STP family is a single-stage centrifugal counter-current system designed to produce an adjustable jet stream for swimming training directly within an existing pool shell. Every numbered position in the diagram below corresponds to a genuine Bosta spare part, each with its own SKU, so you can identify and order the exact component you need in just a few minutes. No factory parent references have been published for this product family, so please use the position numbers and SKUs on this page to cross-reference your unit.

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Each call-out number in the exploded-view diagram maps directly to a numbered row in the parts list below, and every row carries a unique SKU that you can add straight to your basket. Begin by identifying the area of the unit where the fault or wear is visible — for example, the hydraulic section at the back, the nozzle face panel, or the electrical enclosure — then locate the matching position number in that area of the drawing. Once you have the position number, find the corresponding row in the BOM and note the SKU before ordering. Be aware that some position numbers appear more than once in the diagram: position 35 (screw, SKU 7034177) and position 39 (screw, SKU 7034179) are used in several locations across the assembly, and the correct one is determined by where in the drawing the call-out arrow points. Position 21 is a special case — the same number is shared by four different impellers, each matched to a specific model variant, so read the description column carefully before selecting. Two positions in the current BOM — position 28 (pneumatic button nut and bottom) and position 36 (nozzle base) — do not yet carry a listed SKU; if you require one of these parts, please contact us directly so we can assist with sourcing. Always double-check the position number against the diagram rather than relying on the description alone, as component names such as “O-ring” and “screw” appear at multiple positions with different dimensions.

Main replaceable assemblies on the STP Counter Current System

The hydraulic core of the STP system centres on the pump body (position 16, SKU 7017375), which houses the rotating impeller assembly and provides the pressure needed to generate the counter-current jet. Sealing between the wet and dry sides of the pump is handled by the mechanical seal at position 22 (SKU 7017381) — one of the most commonly replaced wear items on any centrifugal pump — and by the O-rings at positions 13 (SKU 7034163) and 17 (SKU 7034166), which protect the inlet and outlet connections respectively. Water enters the pump through the inlet pipe (position 14, SKU 7034164) secured by the inlet nut (position 15, SKU 7034165), and leaves via the outlet pipe (position 18, SKU 7034167) and outlet nut (position 19, SKU 7034168). The impeller itself sits at position 21 and is retained by the impeller nut (position 20, SKU 7017376). The front fascia of the unit is formed by the front panel (position 27, SKU 7017382) and front cover (position 34, SKU 7034176), and incorporates the air regulation assembly — consisting of the air regulation valve (position 23, SKU 7026755), air regulation hose (position 24, SKU 7034169), and pneumatic hose (position 25, SKU 7026756) — which allows the user to adjust jet strength and air entrainment at the nozzle. The nozzle output is further tuned by the air adjuster (position 31, SKU 7034173) and water adjuster (position 33, SKU 7034175), while the rear of the housing is closed by the rear cover (position 30, SKU 7034172). Wall penetration is managed by the Wilde fastening flange (position 40, SKU 7026753) and Wilde adhesive seal (position 41, SKU 7034180), which together form a watertight transition through the pool shell into the main housing (position 42, SKU 7034181). The electrical and motor control components at position 43 (SKU 7034182) include multiple control box variants and engine black boxes to suit different motor ratings and supply voltages.

Choosing between variants and pack sizes

The most critical variant decision on this parts list concerns the impeller at position 21, where four separate SKUs are available: SKU 7017377 fits the STP-2200 and STP-2200SS; SKU 7017378 fits the STP-2200-T and STP-2200SS; SKU 7017379 fits the STP-3000-T and STP-3000SS-T; and SKU 7017380 fits the STP-4000-T and STP-4000SS-T. Fitting the wrong impeller will result in incorrect flow rates and may overload the motor, so confirm your exact model designation from the unit’s nameplate before ordering. Position 43 similarly encompasses several control box options — rated at 4–6.3 A, 6–10 A, or 9–14 A depending on the motor — as well as separate engine black boxes for 230 V and 400 V supplies; selecting the wrong rating for your electrical supply is a safety risk, so match the amperage range to the current draw shown on your motor label. For the two screw positions (35 and 39), the SKUs differ between locations, so use the diagram to confirm which fastener position you are replacing rather than assuming the descriptions are interchangeable.