Looking for the HPS 1-1/2″ (38mm) ID, 1-3/4″ Long Blue Silicone Reinforced Coolant Cap w/Clamp for Bypass Heater Vacuum Valve Water Port? It is on the shelf here, checked and ready to ship.

Silicone tolerates far more heat than standard rubber and stays flexible for many years. Measure inner diameter at the fitting rather than estimating by eye.
If your build is unusual, tell us and we will confirm the clamp for bypass heater vacuum against it.
The clamp for bypass heater vacuum ships protected, because a damaged part helps nobody.
Drivers choose the clamp for bypass heater vacuum here for honest specification detail and quick dispatch.
Buyers comparing the clamp for bypass heater vacuum will find the specification detail on this page rather than in a catalog footnote.
The clamp for bypass heater vacuum listed here is checked against your vehicle before dispatch.
Every clamp for bypass heater vacuum order goes through the same fitment review.
Ordering the clamp for bypass heater vacuum takes a minute and the confirmation reaches you straight away.
Quick specs
- Material: Silicone
- Finish: Blue
- Category: Universal Hose
- Price: $33.55 with free shipping over $99
- Availability: in stock, dispatched from the USA
Manufacturer specifications
The HPS Performance 1-1/2″ (38mm) high temperature reinforced Blue silicone cap is designed specifically to be installed on your cooling system. Vacuum caps have no reinforcement and are intended for vacuum and very little pressure. The HPS reinforced silicone caps are manufactured just like our reinforced silicone radiator hoses. While traditional rubber coolant cap might crack and cause coolant leak, HPS Performance high temperature 3-ply polyester reinforced silicone caps will withstand the high temperatures and pressures of your cooling system for years to come.
HPS Reinforced Silicone Caps are compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
Technical Specification
Product Type: Reinforced Silicone Coolant Cap
HPS Part Number: RSCC-150-BLUE
Temperature Range:- 65 deg. F to + 350 deg. F (177 deg. C)
Reinforced Layer: 3-ply Polyester
Inside Diameter: 1-1/2″ (38mm)
Color: Blue
Wall Thickness: 4mm
Inside Length: 1-3/16″
Overall Length: 1-3/4″
UV and ozone resistant
Remark: HPS reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.
- Material: 3-Ply Reinforced Polyester Silicone
- Color: Blue
- Made of High Temperature 3-ply Polyester Reinforced Silicone. Maximum Temperature Rating: 350 deg. F (177 deg. C).
- Ideal for heavy duty pressure connections and provides excellent resistance for high temperature applications
- Compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
- Inside Diameter: 1-1/2″ (38mm). Overall Length: 1-3/4″
- HPS reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.
Come with a HPS Brand Stainless Steel clamp (match Size) to complete your project
Application:
HPS Reinforced Silicone Caps are Universal Fit that compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
Remark:
Installation: Compatible with Water/Coolant ONLY, Not for Fuel/Oil
Product Content:
- 1 x Coolant Cap
1 x Clamp
The product does not come with manual/instruction, Professional Install Recommended
Cross Reference Number:
- RSCC-150-BLUE, EMSC-40-60, RSCC150BLUE, EMSC4060, 648044907567, 648044825656
Give us the VIN and we will check trim, engine option and drive type, the three details that break fitment.
More in this department: Hoses & Fittings · HPS 1.5″ (38mm) ID, 4″ Leg Long Black 4-Ply Silicone 1/2″ Offset Coupler Hose · HPS 1.25″ (32mm) ID, 6″ Leg Long Black 4-Ply Silicone 1/2″ Offset Coupler Hose · full catalog
Our warehouse team packs the way they would want their own parts to arrive.
Independent information on this topic lives at the NHTSA vehicle safety hub.
Frequently asked questions
How do I know this is the right part?
Send your VIN or your year, make and model and our fitment desk confirms the part against manufacturer data before it ships. The check is free and usually answered the same business day.
What are the shipping times?
Orders placed before early afternoon on a business day usually leave our USA warehouse the same day, and tracking is emailed when the label is created.
How do returns work here?
Parts are covered against defects for the period stated on this page, and non defect returns follow our standard returns window.
What quality checks does this get?
Lines and fittings are checked for pressure rating, inner diameter and ply count before shipping.
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