Raypak 006718F Bypass Spring Kit, All Sizes, for Polymer Headers, 206A-406A, 207A-407A, R185A/B-R405A/B

Raypak 006718F Bypass Spring Kit for Polymer Headers

Part # 006718F | Genuine Raypak replacement part | For polymer-header 206A to 406A, 207A to 407A and RP2100 R185 to R405 (1998 to 2004) heaters

Replacement springs for the internal bypass valve in Raypak polymer (Capron) inlet/outlet headers. The kit covers every heater size. On the 206A to 407A, Raypak's service guide assigns the red spring to the 206/207 and 266/267 and the silver spring to the 336/337 and 406/407.

✅ Fits these Raypak models:

• 206A, 266A, 336A and 406A heaters with polymer headers, built from October 2004 (Raypak's parts list also names the 266 and 399)
• Low NOx 207A, 267A, 337A and 407A heaters with polymer headers
• RP2100 R185A, R265A, R335A and R405A with polymer (Capron) headers, built November 1998 to early 2004
• RP2100 R185B, R265B, R335B and R405B with polymer headers, built October 2003 to October 2004
• Not for ASME metal headers (cast iron or bronze), which use different springs or a combined governor and bypass assembly

🔧 Details:

• Raypak part name: Bypass Spring (All Sizes Included)
• Polymer-header spring colours: red for 206/207 and 266/267 heaters, silver for 336/337 and 406/407
• The springs are also part of bypass kit 006715F, which adds the bypass valve and the dam/shaft

📌 Good to know:

• Raypak's service guide lists a wrong bypass spring among the causes of a knocking heater or one that keeps tripping its high limits, so match the spring colour to the heater size.

Check your heater's model and serial number before ordering.