Injection Molded Water Tank Fitting S136 Tooling Assembled Valve Body Custom Production Service

This service manufactures water tank fittings and assembled valve bodies through custom injection molding, using S136 hardened tooling and engineering polymers that withstand continuous water contact. Typical products include tank outlets, ball float valve bodies, filler necks, overflow fittings and threaded connectors for domestic water tanks, irrigation systems and industrial storage.

We mold the components, fit NBR or silicone O-rings, assemble the valve mechanisms and air-test every unit up to 6 bar, so fittings arrive ready for installation.

• Food-safe material options: PP, PE and PA66+GF grades certified for potable water contact where required.
• Precision thread molding: BSP, NPT and metric threads molded with clean release and gauge-checked pitch.
• O-ring sealing assembly: NBR or silicone seals fitted under controlled conditions to prevent leakage.
• 6 bar air pressure testing: every assembled unit is tested before packing for reliable field performance.
• S136 hardened tooling: wear-resistant cavities keep thread and sealing surface dimensions stable.
• Integrated assembly line: valve bodies, floats and connectors are assembled and torqued in-house.

Water tank fittings produced by this process serve rainwater harvesting systems, pressure tanks, reverse osmosis storage, livestock watering equipment, agricultural irrigation networks and industrial liquid storage. The same tooling technology supports garden valve bodies, filter housings and pool equipment components.

Xiamen KDT Technology Co., Ltd. has provided injection molding and mold manufacturing since 2007. Our integrated facility includes CNC machining, EDM, polishing and a molding workshop with 90 to 650 ton machines, staffed by 40 to 50 engineers and operators. With 80% to 90% export volume, we supply plumbing and irrigation brands across Europe, North America and Australia.

Our engineers support fitting programs with DFM analysis, mold flow simulation and material selection for potable water compliance. We design molds with side cores and unscrewing mechanisms for threaded fittings, and our assembly line handles O-ring fitting, valve insertion and final torque control. For new products, we offer rapid prototype tooling to validate fit and function before production tools are built.

A rainwater harvesting company in the UK sources float valve bodies and tank outlets from us, with every unit air-tested to 6 bar before shipment. Our S136 molds have delivered over 500,000 fittings with a leak rejection rate below 0.2%. An Australian irrigation distributor also uses our PA66+GF molded connectors to replace imported brass fittings, cutting cost by 40% with equal pressure ratings.

Fittings are individually bagged with dust covers, packed in divided cartons and palletized for export. Assembled valves are tested and tagged with the date and operator code for traceability. Final inspection follows AQL 2.5 with dimensional and pressure test records included. Send your fitting drawings and volumes for a complete quotation.