Raypak 950388F Seal Kit
The Raypak 950388F Seal Kit w/Gaskets is the OEM pump seal kit for the Taco-built circulating pump used on compatible Raypak hydronic heating equipment. Raypak replacement-parts documentation identifies the 950388F as the Taco 1600-868CRP water seal kit, supplied with the mechanical shaft seal, a volute/casing gasket and an impeller bolt, so the wet end of the pump can be resealed in one service visit. The standard seal is built from a ceramic seat, a carbon face and EPT (EPDM) elastomers, a combination that suits heated water and glycol-water hydronic loops.
In Taco's own replacement-parts list for cartridge-design pumps, the 1600-868CRP is Item #29, the 5/8-inch shaft water seal kit for the Taco 121 through 138 pumps and the 1600 Series in-line circulators. It replaces the earlier Taco kits 1600-846CRP, 1600-170RP and 1600-170ERP, so any of those older numbers point to this same seal. Taco lists a separate 1/2-inch shaft seal kit, 1600-055RP, for its older-style pumps, so shaft size matters when ordering. The high-temperature Taco version, 1600-868SRP (Sealide-C faces with Viton elastomers), is a separate number and is not the 950388F.
A worn mechanical seal usually shows as a slow weep at the shaft, drips between the motor and the pump body, or rust and mineral crust on the bearing bracket. Before condemning the seal, rule out a leaking flange gasket or fitting, then find out why it failed: air in the loop, dry running, debris, over-temperature or oil contamination will kill a new seal as fast as the old one. To install, isolate and drain the pump, pull the motor and cartridge, remove the left-hand thread impeller bolt, and replace the seal and the volute gasket. Keep the lapped seal faces clean and never touch them with bare fingers. Lubricate the elastomers with a water-compatible lubricant only, because petroleum grease attacks EPT. Refill, bleed the air and check for leaks at operating temperature.
Key Benefits
- Factory Identified Kit: Listed by Raypak as the 950388F and cross-referenced to Taco 1600-868CRP, so the correct OEM seal kit is easy to confirm.
- Complete Reseal: Includes the mechanical seal, volute/casing gasket and impeller bolt to rebuild the wet end without sourcing separate pieces.
- Hydronic Ready Materials: Ceramic/carbon/EPT construction handles hot water and glycol-water systems in Raypak heating equipment.
- Stops Shaft Leaks: Restores the shaft seal and casing joint, protecting the motor bearings and bearing bracket from water damage.
Common Questions
- Is the Raypak 950388F the same as the Taco 1600-868CRP? Yes. Raypak documentation lists the 950388F as the Taco 1600-868CRP pump seal kit, which replaces 1600-846CRP, 1600-170RP and 1600-170ERP.
- Which pumps does it fit? It is the 5/8-inch shaft seal for Taco 121–138 and 1600 Series cartridge-design pumps. Check the pump nameplate for the shaft size and model number, because Taco lists 1600-055RP as the 1/2-inch shaft kit for older-style pumps.
- When should the pump seal be replaced? Replace it when the shaft seal weeps, the casing gasket seeps, or the seal faces are scored or heat damaged. Whenever the impeller is removed for service, a new seal and gasket set is the right call.
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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.