Does the trapped liquid drain back? I cannot see any drain holes in the inner column for return to the boiling flask

Dear Customer, Yes, there is a hole in the inner column. Here is the image: https://s3.amazonaws.com/us-manageimages/c8788220-5d6b-4760-97ab-15033df9e47a_ProductImage_MAIN?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200623T014450Z&X-Amz-SignedHeaders=host&X-Amz-Expires=129600&X-Amz-Credential=AKIA3IQPFAWYJLBVZNYV%2F20200623%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=ecb36837537d7e10312dfc45f88b6bc0c29f4a8425e4d5794d4faea74512da98 Thanks, Lizzy L

Whats the purpose of this attachment and what difference between does it makes?

This is placed between the evaporation flask and vapor tube on a rotary evaporator. When heat/vacuum is applied, occasionally the solvent mixture will violently boil or “bump.” This glassware prevents the solvent mixture from entering the condenser, prevent contamination of the instrument in places that are difficult to clean, and improves overall yield by allowing the solvent mixture to drain back into the evaporation flask. I have never used a rotary evaporator without some sort of bump trap and highly recommend every lab with a rotary evaporator invest in at least two of these.

Size please in mm please? thanks

Dear customer, It's 24/40 mm Thanks, J&D Tech

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stonylab Rotary Evaporator Bump Trap 24/40 Outer Upper Joint, 24/40 Standard Taper Inner Lower Joint, 250 ml

stonylab Rotary Evaporator Bump Trap 24/40 Outer Upper Joint, 24/40 Standard Taper Inner Lower Joint, 250 ml

Product ID: 309852919

Details

Material
Glass
Capacity
250
Brand
stonylab
Bottom shape
Round
Graduation interval
250
UPC
843798170186

🔥250 ml high-capacity trap

🧪24/40 standard taper joints

🛡️Borosilicate glass, heat resistant to 200°C

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₨46085

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Sold byAmazon Sri LankaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧪 Elevate your rotary evaporation game—trap the splash, not the progress!

PEACE OF MIND WARRANTY - Backed by a 1-year limited warranty—quality you can trust, support you can count on.
SPLASH PROOF PRECISION - Prevents solvent splashing and contamination for cleaner, safer evaporation.
UNIVERSAL COMPATIBILITY - Standard 24/40 upper and lower joints fit seamlessly with most rotary evaporators.
GENEROUS 250 ML CAPACITY - Ample volume to handle solvent vapor without interruption or overflow.
DURABLE BOROSILICATE BUILD - Heavy-duty glass withstands up to 200°C, ensuring long-lasting lab performance.

The StonyLab Rotary Evaporator Bump Trap features a 250 ml borosilicate glass chamber with standard 24/40 taper joints, designed to prevent solvent splashing and contamination during rotary evaporation. Built for durability with heat resistance up to 200°C and backed by a 1-year warranty, it’s an essential upgrade for any professional lab setup.

Specifications

ASIN	B08R3NVMZ7
Best Sellers Rank	196,278 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 409 in Lab Evaporation & Drying Equipment
Bottom Shape	Round
Bottom shape	Round
Brand	stonylab
Capacity	250 ml
Country Of Origin	China
Customer Reviews	4.8 out of 5 stars 7 Reviews
Global Trade Identification Number	00843798170186
Graduation Interval	250 Millilitres
Graduation interval	250 Millilitres
Manufacturer	StonyLab Scientific
Manufacturer Part Number	RotaryEvaporator-Trap-24/40-250ml
Material	Glass
Material Type	Glass
UPC	843798170186
Unit Count	1.0 count

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